Wall-Mounting 1U Devices Without a Rack?

c640180 asks: "I need to figure out a way to mount a 1U enclosure in a small closet that doesn't have a relay rack or anything similar. Is there such a thing as a set of right angle brackets that would provide me with 19" wide screw holes so that I could mount the device vertically (so that the screws would be pointing down)? how do other folks who don't have real network closets mount real networking hardware?"