My chessboard was a super cheap one and the magnets in the bases of the chess pieces were too weak to hold onto the board mounted on the wall so I had to replace them all with stronger ones of the same size.
1st photo: chess set mounted on wall
2nd photo: chess set mounted on refrigerator
3rd photo: lazy susan screwed into wall
4th photo: shows magnets hot glued into some foam that was hot glued onto back of chess set board. Had to cover the magnets with some tape because if you don't, they will adhere to a metal surface so powerfully that it will be hard to remove the chess board from the metal surface.