This is the first year I have a unit in the yard. I followed someone's example here on the board and vertically attached a 3/4" PVC pipe to the back of the case. I pounded a 1/2" rebar into the ground and slid the pipe over that. The pipe is long enough so the plugs on the bottom clear the ground. I have a black storage tub I got from Walmart, flipped it over so it covers the unit and by a fortunate set of coincidences, the edge of the tub is about 4"-6" above the ground. Earlier I was considering making a frame out of PVC and building a small roof on that. But this seems to work ok so far.
I also sprayed the front and back of the circuitboard with Corrosion X before mounting it in the case. If you cannot find it in your area, try gun stores and fishing stores. Use the red can, not the blue "HD" Heavy Duty stuff.