You can add to the tightness of the hooks by installing them with optionally available o-rings. I used the o-rings and the hooks are very stable. Very happy with the wall control units.
Sorry for the poor resolution. Used my iphone for the pics. Just installed some wall control panels to help organize my bike tools. Turned out pretty nice so thought I'd share a few pics in-case anyone else is considering something similar and wants an idea for what the project might look like.