I have some on shelves, but most of my aircraft are suspended from the ceiling. I made a rig that I think is pretty neat. It allows me to suspend 10 planes and I can adjust the attitude of any plane easily at any time.
Fishing line is attached near the base of the tail fin. Then it is threaded through two holes on opposite sides of a small wooden disk. The other end of the line is attached to the plane just behind the propeller. The wooden disk has a third, central hole that attaches it to a 1 x 2 that is fastened to my ceiling.
The A/C can be rotated in any of it's 3 axes. It gives me the ability to change the display easily whenever I get tired of a certain view.
Right now all my stuff is "in the boys room". WWII aircraft are not authorized for use as decoration anywhere else in the house.