You'd think that somewhere, someone would show the back of this stupid thing. I don't know of any that have a really good mounting system- most have key holes that are too small, the slots aren't deep enough to handle most screws, the provided screws are garbage or the little tabs they provide are generally useless.
Why would it be so hard to mold a screw tab at each end and use a snap-in cover to conceal it or a ferrule that is molded into the front or back? Those would cover ALL mounting situations.