Several extinguishers are great but might be a hazard in a crash if mounted behind legs/feet with typical extinguisher mounts. Behind the seat pedestals should much better. Also better to walk away than to open the engine hatch and then go for skin grafts. The D pillar vents might be ok and with great care the oil filler door but unless you are dressed like a fireman it might be better to be a track star. I can't imagine that it would hurt to have an archive of pictures of your mint machine during the negotiations with your insurers.

Ian