I needed hooks for my glass shower since the suction cup ones keep falling off. I made this specifically for my glass thickness of 9.25mm with a little tolerance for a tight fit. It needs a bit of finishing after print since it has the rounded corners printed with support, but I thought it was worth it for the aesthetic and function.
I also made these matching adhesive command strip hooks:
https://makerworld.com/en/models/395483#profileId-296765