Currently, you could not change the position of the check box. The code below does not effect at all the appearance of the checkbox in the RadListView control:
e.VisualItem.ToggleElement.Alignment = System.Drawing.ContentAlignment.MiddleCenter;
e.VisualItem.ToggleElement.TextImageRelation = TextImageRelation.ImageAboveText;
e.VisualItem.ToggleElement.TextAlignment = System.Drawing.ContentAlignment.TopCenter;
e.VisualItem.ToggleElement.ImageAlignment = System.Drawing.ContentAlignment.BottomCenter;