I've found that drilling a fairly small hole in the back mounts ... parallel to the back of the case in the extenal stand-offs ... gives you a quick, cheap and reliable to run small gauge wire through the case and then attach to anything easily. I attached three LE(s) to my spiral base (steel frame) using that method and it worked great. My neighbor attached to megatree poles as well. You can buy 400' of wire in the rebar section for like $5 and its great and throw-away when done. It does get your hands dirty if you don't wear gloves. Another person mentioned that using dollar store athletic tape is a great way to label stuff for cheap.
I cut slits in the back center stand offs, slipped auto hose clamps through and clamped them to pieces of PVC stuck in the ground. Worked great, easy on and off. I did use silicone around where the clamps enter and exit the box.