I have a floating shelf which sadly due to the weight of it (and it is from IKEA) it is sagging. However, the shelf fits in an alcove so both ends are against a wall. I'm looking for something that is as invisible as possible to help support each side and stop the sagging. Can you recommend the best wall fixing to use to prop the underside of the shelf up? It will be fixed to a plasterboard so wasn't sure whether simple hammer in shelf supports would work
