I have a magnetic knife holder mounted on pivot hinges underneath a cabinet over a workspace. The one thing that’s been driving me nuts is the steel won’t stay put - being round, it rolls off with the slightest nudge.
I finally spent a moment coming up with a way to keep it in-place. The slots in the side pieces are ever-so-slightly angled so the front and back pieces “snap” it onto the knife holder. Works like a charm!
(“Purebond” 5/32" Maple ply.)