An apparatus for aiding in hanging an object on a wall comprises an elongate horizontal bar having a longitudinal axis and a top surface and at least two holders slideable on the bar along the longitudinal axis. Each of the holders includes at least one projection for holding an object hanger at the desired mounting location while a fastener is used to mount the object hanger on the wall. The assembly may optionally include at least one level mechanism for indicating when the apparatus is level. Positioning at least two of the at least two holders spaced apart from each other on the bar allows for properly positioning and mounting the object hangers held by the projections at the desired locations on the wall.