A wall-mountable modular assembly is provided for mounting bathroom accessories on a wall or other supporting surface. The assembly includes a plurality of substantially identical supports and a plurality of accessories that are releasably mountable on the supports. Each support includes a suction cup and a cam lever that is pivotally movable from a release position to an actuating position for actuating a griping engagement of the suction cup with the wall or other supporting surface. The accessory is releasably engaged with the support when the cam lever is in the actuating position.