Battery, Coolsuit, and Accusump can be mounted wherever you wish. The main thing for a battery box is its sole purpose must be to protect the battery, not add extra weight. If you have a box that weights a couple of pounds you are good, 50 lbs would not be accepted.

Same with a coolsuit. A standard size cooler is acceptable, a 20 gallon home-made cooler would not be.

I don't know off the top of my head about the fire bottle placement though. Not sure if it needs to be in a place protected from a possible impact.