Just a firefighters take....if your car is on fire, get out and get away from it.
Think about how much time it takes to open a Gen 1I/II hood (4 part procedure). Think about it for a second, while you're fiddling around opening the latch, then the safety, then lifting the front, then opening from the back, that small fire could become a fully involved engine fire or worse, there could be an explosion.
You are wearing STREET CLOTHES that burn. If it is any kind of decent fire, when you open the hood (before you have a chance to aim and blast the extinguisher) YOU could be what's burning!
We wear full body protection including Nomex fire hood with the mask....and still we can get burned.
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So, it's nice to know you have an extinguisher in the car, but think carefully before you go charging in trying to save your Viper....remember, its a car and you have insurance...it can be replaced. Burns are the worst injury to have, you can't replace your face.....THINK!
Just my opinion.
By the way, Dave, I do like the look of the Roe unit installed in front of your pass. seat.