Nice truck...a few things though.
Nitrous bottles have a siphon tube in them, the bottle should be angled up with the valve facing forward. Nitrous is a liquid, when your bottle runs low and you go WOT the nitrous will be pulled away from the siphon tube and you'll be spraying nothing. Even straight sideways is better than what you have.
Next...safety. Get a blow down tube in that thing. If the pop off vent goes while you're in there you're in for a world of hurt. That bottle packs enough energy to do this:
Blow down tubes are cheap and easy to install...don't get hurt or killed just to save a few bucks. I've been drag racing for over 20 years...I've seen some gnarly nitrous mishaps up to and including a bottle going off in a car as it pulled out of the track. Screwed up 2 guys pretty bad plus the driver crashed the car when it happened.
Nitrous is a lot of fun...you have to treat it with respect though.