Vray Proxies - Wont snap

Hi I am a new convert from Sketchup to Rhino, I am struggling as when I place proxies from cosmos - there seems to be no way to snap to them to allow you to locate them accurately on a plane or other object - in SketchUp this is simple as they are snapable but i am having to manually adjust everything leaving most things either slightly sunken or slightly hovering - am I being stupid! I have tried most of the snap settings but cant find anything about this?

Hello @boundary ,

Are you placing Assets in the Perspective view?

If you set Osnap settings to End/Near/Knot/Vertex and try it in the Right or Left view does it snap the way you need?