Battery Shutoff switch location question

Hi Folks - I have relocated my battery to the trunk, on the passenger side. If I want to go to a track, I need a power cutoff switch. I know how to wire it in, but I've been trying to figure out the best location.

The picture attached is the underside of the area where my battery is. (The hold-down bracket bolts are visible in the picture.) I'm wondering if I'm allowed to place the switch where I'm holding it.

It's hard to tell, but there's probably 3" clearance between the switch and the leaf spring, so interference isn't an issue.

Any reason I can't put it there, or does it need to be "inside"?

One advantage of putting it there is that I could hide it behind one of the bumperettes when I'm not at a track, and would still be able to use it.

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God forbid there's a car fire. You're not going to want to reach under the fuel tank to throw a switch