Corner shelf is what I use now, and my husband loved it so we got another one for him. It’s not rotating but has enough space for all the things I need in my bathroom and keeps the rest of the area free.
Links to products below. The shelf is complete hermit crab safe, it’s all bamboo, except for the legs which are metal. I lined them in 2 sided carpet tape (link below) and pieced on segments of that terrarium carpet liner. The crabs love it cause they can climb up the legs as well. You can also line the top of the bamboo shelves with the carpet liner, like I did, so they can grip on it and walk easily. The two sided tape made it a very simple project.