Not sure if you can drill into the wall or not, but if you can you could always get a wall mounted floating shelf. They come as simple and cheap as closet wire style or as fancy as decorative wood/glass. I had a bunch of them in my room growing up, as long as you don't put too much weight on them they're great.
You can even get some that are so small you wouldn't be able to see them, just a "floating" cage.
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