If it's a stud wall you usually have ply patress behind to carry the weight of the screw, if it's dabbed you fix to the block work with two screws though the hangers that carry the carcass.Don't know tbh flynny. No one has mentioned before how does it work. Do you know where the holes will be and would you support that space with, let's say noggins , or something else .... I have seen some really bad failures on site and still not convinced a screw can hold it. I have seen it many times boards shifted only because the ply was not fixed proper to the studs . not getting into argument here, if it works on domestics that's fine by me. Was curious to see how it's done.