A rack is a great way to store a hard top, but they do take up floor space and are susceptible to bumps and dings. I made my own wall rack out of scrap lumber and bits and pieces from the hardware store. It is mostly 2×3’s, with a few 2×4’s and some scrap plywood thrown in for stability. It it hinges at the back so that I could set the top on it and then raise it up out of the way. I used a strap clamp to hold the top in place until it was horizontal. The strap would still be there today but I needed at one point and removed it. Hopefully, I will remember to put it back before I lower the rack, although I think it would still stay in place.
I can provide more details and photos if needed.