I covered my boards with white felt and attached them to the wall with L screws. The long side is threaded and screws into the wall. The short holds the board in place. It only takes a few as the boards are very light weight. You can just turn them to the side if you want to take the board down for any reason and it only leaves a few holes to patch if you must remove them later. You can find L screws at any hardware store in different lengths so you will need the thread plus the thickness of your board.
Beth