Summary

I'm using a 45mm suction cup just like these and I take off the hook:
https://www.amazon.com/gp/product/B06XGWCCCR/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1

Capable of holding a lot depending on you "dense" you print the hook.
This was designed to hold my and the wife's shaving razers in the shower and suction to the tile wall.

Happy Printing!!!