I've just put a nail in each base and a rare earth magnet in each vehicle.
It works as a charm.
I've later also added a very thin magnet on top of each nail to really reinforce the bond, but they aren't needed unless its a Ravager standing inclined on terrain.
I don't use the clear flying stands at all, not even for my Razorwing.
Harlequinade Macabre - Project Log