diff --git a/src/Uno/Prism.Uno/Dialogs/DialogService.cs b/src/Uno/Prism.Uno/Dialogs/DialogService.cs
index 55c0d03067..67e159b98c 100644
--- a/src/Uno/Prism.Uno/Dialogs/DialogService.cs
+++ b/src/Uno/Prism.Uno/Dialogs/DialogService.cs
@@ -16,16 +16,27 @@ public DialogService(IContainerProvider containerProvider)
             _containerProvider = containerProvider;
         }
 
-        public void ShowDialog(string name, IDialogParameters parameters, DialogCallback callback)
+        public async void ShowDialog(string name, IDialogParameters parameters, DialogCallback callback)
         {
-            parameters ??= new DialogParameters();
-            var windowName = parameters.TryGetValue<string>(KnownDialogParameters.WindowName, out var wName) ? wName : null;
+            try
+            {
+                parameters ??= new DialogParameters();
+                var windowName = parameters.TryGetValue<string>(KnownDialogParameters.WindowName, out var wName) ? wName : null;
+
+                IDialogWindow contentDialog = CreateDialogWindow(windowName);
+                ConfigureDialogWindowEvents(contentDialog, callback);
+                ConfigureDialogWindowContent(name, contentDialog, parameters);
 
-            IDialogWindow contentDialog = CreateDialogWindow(windowName);
-            ConfigureDialogWindowEvents(contentDialog, callback);
-            ConfigureDialogWindowContent(name, contentDialog, parameters);
+                var placement = parameters.ContainsKey(KnownDialogParameters.DialogPlacement) ?
+                    (parameters[KnownDialogParameters.DialogPlacement] is ContentDialogPlacement placementValue ? placementValue : Enum.Parse<ContentDialogPlacement>(parameters[KnownDialogParameters.DialogPlacement].ToString() ?? string.Empty)) : ContentDialogPlacement.Popup;
 
-            _ = contentDialog.ShowAsync();
+                await contentDialog.ShowAsync(placement);
+            }
+            catch (Exception ex)
+            {
+                var str = ex.ToString();
+                await callback.Invoke(ex);
+            }
         }
 
         IDialogWindow CreateDialogWindow(string? name)
diff --git a/src/Wpf/Prism.Wpf/Dialogs/KnownDialogParameters.cs b/src/Wpf/Prism.Wpf/Dialogs/KnownDialogParameters.cs
index aef08f71d8..8d2231608c 100644
--- a/src/Wpf/Prism.Wpf/Dialogs/KnownDialogParameters.cs
+++ b/src/Wpf/Prism.Wpf/Dialogs/KnownDialogParameters.cs
@@ -10,7 +10,12 @@ public static class KnownDialogParameters
     /// </summary>
     public const string WindowName = "windowName";
 
-#if !HAS_WINUI
+#if HAS_WINUI
+    /// <summary>
+    /// The <see cref="Microsoft.UI.Xaml.Controls.ContentDialogPlacement"/> to use when showing the dialog
+    /// </summary>
+    public const string DialogPlacement = "dialogPlacement";
+#else
     /// <summary>
     /// Flag to show the Dialog Modally or Non-Modally
     /// </summary>