Here you can see the plate mounted with the Safecraft billet mount. This way it's held in place by the front seat bracket bolts. It's shaped like a T with a slight offset so that the extinguisher sites centered to the seat. We also put a slight angle (using a break) at the intersection of the T so it would sit right.
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones:
https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS