Glue on Shelf

This is a shelf I designed to hold my phone and glasses next to my bed, I have concrete walls and I don't want to drill into that, the pattern on the back is to help glue stick (hot glue will probably work best for easy removal, it might pull the paint off the wall if that is a concern)

You could easily drill holes and mount it the old fashion way, this is definitely over supported/bulked, better to be too sturdy than not sturdy enough