Installed in a concrete block wall. When 6 Tapcons were brought in, this was not enough to support the weight of the tanks in the middle. So I put another one on top of the slippers in the middle. The part that holds the containers is very fragile. I had to drill a pilot hole with a regular drill because the concrete drill just broke it. Although the Benz looks solid. This is just a first impression, long time no use. I'll probably buy a metal back for the bins.