This is a redesign of a design called Toy Shelf I found on the Prusa site. {https://www.prusaprinters.org/prints/35416-toy-shelf}

This is specifically designed to hold a phone, you can decide if that is in your bathroom or a spot in your kitchen or wherever.

It will hold plenty of weight, the limit is really going to be which strength Command Strips you use and how many. Place one Command Strip on each vertical near the top of each upright. You could put a second one at the bottom to make it sit more upright. I have some very strong hook & loop Command Strips (16lb) and I will often split them or cut them down to fit the space allowed.