I've also got a pair of the Red Chili Checker cheapies... with dual batteries you can run one off of each battery to double up. They work ok enough, but if everyone else has OBA and CO2 you'll be the last guy filling up for sure, but park next to them and they'll probably do a tire for you.
IMO don't hard mount it, your engine bay is hot and heat is the enemy.. plus you could toss it in the 40 as backup just in case your CO2 runs out again... I'll toss one of mine in the 80 just in case of OBA failure.
82 fj40, 99 uzj100, 06 gx470
05 525EXC, 01 XT225, 09 TTR125, 07 TTR90, 07 CRF50