Abstract: An adjustable wall mounting apparatus and method of installing the same includes a plurality of vertical uprights and a top rail assembly. The top rail assembly is configured to be mounted to a surface to achieve a selected top rail width. A plurality of covers having a predetermined length are provided. Each cover is adapted to mount to and hide exposed portions of the installed support rail segments. Each cover can be positioned between and act as a spacer to set a predefined distance between adjacent ones of the plurality of vertical uprights hung from the support rail segments. The method includes installing the top rail, hanging an upright, and then using covers to correctly space additional uprights hung from the top rail.