The present invention relates to a device for mounting wall objects. The device has a vertical member and a horizontal member attached to one another along a fold line. The vertical member has a wall-facing side that engages and is secured to a wall or surface by receiving connection members through one or more mounting holes. The horizontal member, in some arrangements, has a pair of flanges that form a gap along an outer end opposite the fold line. A pair of spaced-apart support braces that form a slot extend generally down the middle between the horizontal and vertical member. The slot allows for the reception of a brace or clamp that can be held in place by inserting a locking pin through aligned sets of locking holes and through either a brace hole in the brace or a fixing hole in a transverse hole of the clamp.