Replying to Warping camber with improper stoarge?

Ive used the search bar and cant really find any definitve answers to whether or not storing skis hanging from the tips, resting horizontally base to base with brakes together or simply lying flat on a shelf is best? Wondering if you guys have heard that any of these storage methods can warp the shape of skis, Ive been storing mine in a rake with the bases and brakes together for years, but im wondering for the sake of soemthing else?