Tree Boa Perches

[wnateg]

I used expanding foam: https://www.instagram.com/p/B3QOg9VB..._web_copy_link

You can also use silicone to secure cups, like these:

https://www.amazon.com/Closet-Rod-Ho.../dp/B0038ZQ0G2

with this silicone:

https://www.amazon.com/GE-Silicone-Purpose-Caulk-GE012A/dp/B0000CBIH9/

Edit: I like the magnetic ones posted above, but I would be worried my ETB would be too fat for them.