I use 3 styles, no plans just freehand them, depending on size, weight & wings staying attached. All the stuff is 3/4" from Home Depot & the cost is about $2 per plane. On the racks in the dormers I hang 4 planes per rack & there is no problem with the weight.

BTW: The empty rack in front of the B-25 holds a e-powered 1/4 scale Piper PA-12. I back that one up with some small bungee cords.