Why mess around with wall-mount brackets? You'll be cramped for depth when you want to throw in a real PoE switch, or some other gear you're not thinking about now.
They also have swing-out racks that you can open the front and back from (as there are hinges on one of the back sides), but you'll pay quite a bit for these. I believe they are somewhere in the realm of $300-350 when we buy them for clients.
Personally - I like lots of space, because you never know when you'll want to end up building a home theatre or adding another server, and centralizing all the gear where it should be - the server room. I have 42U 4-post black open frame rack (from a common manufacturer), that I picked up off Craigslist for $150 (normally $400 new)...and put it in a closet I converted into a server room. Put down a new floor, and raised the floor a couple inches where the server rack goes (no underfloor cooling unfortunately). Two dedicated 20A 110V circuits, two 1500VA batteries w/ mgmt cards, two 15A PDUs. CAT6 patch panel in the rack, also have a 2x2 wallboard with 66 block for CAT3 termination. No 6509 yet ;)