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I've got 2, one unser the passenger seat at the front and one in between the middle of the front of the back seats, just above the transmission tunnel.
I was going to drill pilot holes and use self tapping screwe, however, the extinguishers I bought had an option of coarse velcro on the holders so I tried it straight onto the carpet and it works surprisingly well. They've been in for over a year and I've done track days etc and they are fine.