Yes, currently you do not have the GetPosition
You can use the e.Options.CurrentDragPoint to get the position of the mouse with relation to the window in which the DragDrop occurs.
If you want to get the mouse position with relation to an element, you can transform this element (element.TransfromToVisual(currentWindow).Transforn(new Point())
with relation to the window and substract the two points.
Do you think this will work for you?
the Telerik team