the base panel 52 comprises a substantially planar member extending between top and bottom edges 64 and 66 respectively as illustrated the top edge 64 may be substantially perpendicular to the central axis 42 of the socket while the bottom edge 66 is angularly oriented relative to the central axis 42 as illustrated in fig6 the bottom edge may have a bottom incline angle generally indicated at 68 of between 0 and 60 degrees relative to a plane perpendicular to the central axis the top and bottom incline angles 48 and 68 will be selected to correspond to each other such that when sockets of adjacent apparatuses 20 are located adjacent to each other they may be abutted against each other as illustrated in fig1 and 4 as illustrated the first side panel 34 may have a length selected to extend above and below the top and bottom edges 44 and 46 of the base panel 32 while the second side has a length selected to extend above the top edge 44 of the base panel 32 in such a manner the first and second side plates of such abutted sockets may be overlapped with each other as will be more fully described below with reference to fig4 in operation a first apparatus 20 a may be located on a wall stud 6 with the front edge 12 of the wall stud received within a first socket 30 thereafter a second apparatus 20 b may be located on the same wall stud 6 with front edge 12 of the wall socket being received within the second socket 50 at a position above the first socket 30 of the.