Xamarin.Forms: how to set Images to get the expected result - image

Question

I'm looking for a good way to implement a control that looks like a ListView with 2 columns, where each column has distinct height. As I didn't found another solution, I've decided to do it through a Repeater control.
The expected result is something like this:
All the items come from the same DataSource, and this DataSource will contain between one and a dozen of items.
The items must be splitted automatically (by modulo) into the 2 columns
When the user click on the button related to the item, this will open the item's detail page
The red squares are images that must have the same height/width
I'm working on the design of the cell DataTemplate, but I didn't see how to manage the images:
The distinction between the 2 columns is given by a Grid containing 2 Columns
Then I specify the DataTemplate for each column
<ScrollView>
<Grid Padding="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!-- Col.1 -->
<tabletControls:Repeater Grid.Column="0" Margin="10"
ItemsSource="{Binding ListProductItems}">
<tabletControls:Repeater.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Vertical" >
<StackLayout>
<ffimageloading:CachedImage Source="{Binding Icon}"
Aspect="AspectFill"/>
</StackLayout>
...
</StackLayout>
</ViewCell>
</DataTemplate>
</tabletControls:Repeater.ItemTemplate>
</tabletControls:Repeater>
<!-- Col.2 -->
<tabletControls:Repeater Grid.Column="1" Margin="10"
ItemsSource="{Binding ListProductItems}">
<tabletControls:Repeater.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Vertical" >
<StackLayout>
<ffimageloading:CachedImage Source="{Binding Icon}"
Aspect="AspectFill"/>
</StackLayout>
...
</StackLayout>
</ViewCell>
</DataTemplate>
</tabletControls:Repeater.ItemTemplate>
</tabletControls:Repeater>
</Grid>
</ScrollView
But this doesn't work as expected, as the image's height/width are not the same:
I already tried to play with Aspect (AspectFill, AspectFit, Fill) or VerticalOptions/HorizontalOptions, withou any result...
Is it possible to achieve the expected result without specify an HeightRequest? Are there other options?