public class Unit : NotifyPropertyChangedBase
{
  public float ScreenPosX { get => _x; set { _x = value; OnNotifyPropertyChanged("ScreenPosX"; } }
  public float ScreenPosY { get => _y; set { _y = value; OnNotifyPropertyChanged("ScreenPosY"; } }
  public float Life { get => _life; set { _life = value; OnNotifyPropertyChanged("Life"; } }
  ...  
  private float _x, _y, _life;
}

public class Army
{
  public ObservableCollection<Unit> Units { get; }
  ...
}

<Grid
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Grid.Resources>
    <DataTemplate x:Key="UnitTemplate">
      <ProgressBar Value="{Binding Life}" Width="60" Height="10"/>
    </DataTemplate>
  </Grid.Resources>
  <ItemsControl ItemsSource="{Binding Units}" ItemTemplate="{StaticResource UnitTemplate}">
    <ItemsControl.ItemsPanel>
      <ItemsPanelTemplate>
        <Canvas/>
      </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemContainerStyle>
      <Style TargetType="{x:Type ContentPresenter}">
        <Setter Property="Canvas.Left" Value="{Binding ScreenPosX}"/>
        <Setter Property="Canvas.Top" Value="{Binding ScreenPosY}"/>
      </Style>
    </ItemsControl.ItemContainerStyle>
  </ItemsControl>
</Grid>

        <ItemsControl ItemsSource="{Binding PlayerFleet.Ships}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
					<Canvas/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <controls:SpaceObjectIcon></controls:SpaceObjectIcon>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
            <ItemsControl.ItemContainerStyle>
                <Style TargetType="{x:Type ContentPresenter}">
                    <Setter Property="Canvas.Left" Value="{Binding ScreenPosX}"/>
                    <Setter Property="Canvas.Top" Value="{Binding ScreenPosY}"/>
                </Style>
            </ItemsControl.ItemContainerStyle>
        </ItemsControl>

<UserControl x:Class="rtg.Controls.SpaceObjectIcon"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:rtg.Controls"
             mc:Ignorable="d" 
             d:DesignHeight="100" d:DesignWidth="100" Width="100" Height="100" HorizontalAlignment="Stretch">
    <Grid Width="100" Height="100" HorizontalAlignment="Center" VerticalAlignment="Center">
        <Border VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Padding="5,5,5,5" BorderThickness="1,1,1,1" BorderBrush="White">
            <Grid Height="Auto" Margin="0,0,-2,-2" Width="Auto">
                <Image Source="/spaceship_icon_white.png" Stretch="Uniform" Height="90" Width="90"/>
                <Button Content="Button" Panel.ZIndex="-1" Background="{x:Null}" BorderBrush="{x:Null}"/>
            </Grid>
        </Border>
    </Grid>
</UserControl>

public static class CenteredCanvas
{
    public static float GetX(FrameworkElement element) { return (float)element.GetValue(XProperty); }
    public static void SetX(FrameworkElement element, float value) { element.SetValue(XProperty, value); }
    public static readonly DependencyProperty XProperty = DependencyProperty.RegisterAttached(
        "X", typeof(float), typeof(CenteredCanvas), new PropertyMetadata(0.0f, OnPosChanged));

    public static float GetY(FrameworkElement element) { return (float)element.GetValue(YProperty); }
    public static void SetY(FrameworkElement element, float value) { element.SetValue(YProperty, value); }
    public static readonly DependencyProperty YProperty = DependencyProperty.RegisterAttached(
        "Y", typeof(float), typeof(CenteredCanvas), new PropertyMetadata(0.0f, OnPosChanged));

    private static void OnPosChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        FrameworkElement element = d as FrameworkElement;
        if (element != null)
        {
            element.SizeChanged -= OnElementSizeChanged;
            element.SizeChanged += OnElementSizeChanged;
            UpdatePos(element);
        }
    }

    private static void OnElementSizeChanged(object sender, SizeChangedEventArgs e)
    {
        UpdatePos((FrameworkElement)sender);
    }

    private static void UpdatePos(FrameworkElement element)
    {
        Canvas.SetLeft(element, GetX(element) - element.ActualWidth * 0.5);
        Canvas.SetTop(element, GetY(element) - element.ActualHeight * 0.5);
    }
}

<ItemsControl.ItemContainerStyle>
  <Style TargetType="{x:Type ContentPresenter}">
    <Setter Property="CenteredCanvas.X" Value="{Binding ScreenPosX}"/>
    <Setter Property="CenteredCanvas.Y" Value="{Binding ScreenPosY}"/>
  </Style>
</ItemsControl.ItemContainerStyle>