A mounting device for attaching an object to a supporting structure includes a first member including at least one first magnet and a projection, the first member configured to be attached to a supporting structure, a second member including at least one second magnet and a recess to receive the projection, the at least one second magnet configured to be attracted to the at least one first magnet, and an electromagnet selectively operable to provide magnetic force to couple the first and second members together. A method of mounting an electronic display to a supporting structure also is disclosed.