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I'm going to do it... Been talking about it for years..
I have an open wall by the door with nothing to do and 4 keyboards just leaning on said wall up to no good. I want to hang them up on like a shelf system you'd see at your local music store. I've called my guitar center to see if their "hang up you keyboard on the wall o'matic system" is for sale but it isn't.. All boards need to be powered, plugged in, and MIDI'ed. ( I know, I have soft synths also )
Personally I use free-standing keyboard racks and stands. Allows for non-destructive changes to the setup. That's one of the major things to have thoroughly thought out before you go mounting things to a wall. It's also easier to change things without having to worry about a keyboard falling off any kind of bracketry and therein lies two other major concerns. First is whatever bracket you mount to the wall make sure it's securely mounted into a stud and not just the drywall (I really don't trust molly bolts). And the second is to make sure your keyboards don't come sliding off said brackets. Not all keyboards have a nice square front lip to keep this from happening.
For instance take something like a Yamaha Motif keyboard. The lower front is angled and if you tilt the keyboard so the front is lower than the rear unless the front of the bracket or shelf you're using is high the keyboard can slip off while you're playing (had it happen to me). And if you make the front lip high enough to keep that from happening then it gets to be too high to comfortably play.
You could get the stuff you need at a Lowes or Home Depot but this isn't something to do if you don't have some basic home repair skills and don't know the construction of your walls. And if you have plaster and lath walls there's no real telling where your studs are.
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