I ordered some wire mesh shelves for my kitchen, “Seville Classics 2-Tier Iron Mesh Adjustable Floating Wall Shelves, 36″ x 14″, Satin Pewter.” They looked cool.
Unfortunately, their manufacturing tolerances were way off. The shelves tilted downward into the room. A lot. The front edge of the shelf was about 2cm (almost an inch) lower than the back. Stuff on the shelves would work their way to the edge and then fall off.