Saw a german documentary (ARD) re. electric cars fires a couple of years ago... lots of cars reported catching fire.
The solution, they've ended up with, is having 40 ft. containers on stand-by.
On alarm, drive the container to site, fill it with water and submerge the vehicle. And leave it there for days...
Everything else always failed.
Strange those experiences aren't shared? At least through the manufactures... or they haven't spent any time considering solutions to the more or less unlikely event that any of their vehicles may catch fire?