Just make sure they understand that many race functions require you to have it I think 6" from the firewall. Hard to tell in that pic but it looks too close. Does not matter for street use but this is something they need to be aware of if going to a sanction event.
Glens Performance regulator mounted on the left side near the firewall
I also have mine mounted on the drivers side firewall next to the brake booster.
I would think the fender well isn't ideal because of the debris that can be shot up at it during road driving.