Hi folks. I bought a floating shelf with associated brackets to fix to a tiled wall in a shower room. I drilled and plugged for the brackets between tiles (ie: on the grout line) to avoid cracking any tiles. The rawlplugs and screws are substantial and the brackets, once in place, feel really tight with no apparent movement. However, there is noticeable play on the shelf (front to back) when I push it back fully in place on to the brackets and screw it from underneath to prevent it sliding forward. Needless to say I am quite disappointed with the result and wonder if it’s just a bad product (shelf is mdf 24” x 8”, approx). Anyone else had this problem and overcome it ?