In one general aspect, an apparatus can include a display portion, a base frame coupled to the display portion where the base frame includes a channel defined by a top wall opposite a bottom wall and a side wall coupled to the top wall and to the bottom wall. The side wall can have an outer surface defining at least a portion of an outer perimeter of the base frame. The channel can have a first portion on a first side of the base frame and a second portion on a second side of the base frame opposite the first side of the base frame. The apparatus can include a midplane having a first edge disposed in the first portion of the channel and having a second edge disposed in the second portion of the channel.