My solution
Here is what I did.
Very quick and easy.
This is a standard auto fire extinguisher that comes with a plastic bracket that it snaps in and out of and it is secured with quick release strap.
In this location, the whole thing is nicely wedged in to place, basically resting on the floor. I didn't want to drill to the floor, so I used the lower part of the console just above the floor to mount it. I marked the hole locations after finding a nice snug fit.
I took apart the back of the console (easy) and drilled two holes for the bracket.
The console plastic is nice and strong, but I still used a piece of aluminum plate on the inside to reinforce the mounting location. I curved it slightly for a nice tight fit.
The extinguisher is wedged in, so there are no forces that could rip it out even under the most extreme conditions. It doesn't move or rattle. It is easily accessible from every seat and yet, it is out of the way, tucked away in a spot that looks like it was meant for it
.
One more thing I want to add is an industrial velcro strap in addition to the plastic quick release strap.
Sorry, no pics of the install process, but it really is quite simple.