Anyone else found that these things are a great idea in theory and maybe even for a showroom where the walls are simple, but in practice they are a nightmare as you are forced to put the wallplate in specific spots on your walls which may have pipes, cables, bodged holes etc already there? After giving them up as a bad job on some units I just installed I nailed MDF strips along the back of the unit and was free to drill wherever I wanted to put the unit up.