GC VALVES

i just received my GC vales(4), that i got from suicidedoors.com, i was wondering how would i mount them, i know you can get mounting bracekts from online but i was hoping i could go to lowes and find a bracket that i could fabricate to fit the GC valves but i'm not sure how to mount the bracket onto the valve. would i have to drill into it at i certain spot, any help would be appreiciate, also the valves have a cover on them and when you unscrew that cover off it shows 3 prongs(which i assume are to connect power and ground), what purpose does that cover serve cause i don't see how you would connect your wires unless you remove the cover, would i have to screw it bak on. Thz