nice for the order but somewhat unstable

The installation fairly simple, using each plate only 4 fixtures flexes the base plate in hard-filled boxes. So with 2 base plates as offered here, this means 12 holes in the wall. I have attached my particle board as the back wall with 6 screws and screwed there 2 sets = 4 base plates on chipboard, which holds and requires less screw fastenings in the wall. The stacking boxes are stable and allow a clear order. The small boxes sitting slightly loose on the holders. Boxes have the rear edge 2 small holes where I screwed 2 small screws for securing, holding super.