hmm, ok, take 4 of what BRS sells and make a box out of them so all 4 side of the box you can mount equipment to if it was all accessible. Now take 2 of those sides away. You are left with 2 that makes a corner of the box and 2 sides. Then there is a square top and bottom made that the sides are secured to. One of the open sides butts up to the side of the cabinet and other open side, call it the back now butts up to the wall.
basucally taking your cabinet with coralvue and removing the back and one side and then instead of having just the front to mount equipment to, you duplicate that front to the side.
make more sense? For me right now it accomplishes two things. More mountable surface and it’s black. My cabinet is dark. Picture shows where is place it.