Battery relocated to trunk, inertia switch?

I myself like the ford solenoid as the main starter wire running inside my car is dead unless cranking. As for the Inertia switch I would look at a simple Ford Ranger switch that you could cut power to the electric fuel pump if your running one so in a rear end crash your pump shuts off. If not wire it to kill your ignition to kill the engine. Just my thoughts but believe me I'm no expert. I've thought of adding this valve near my tank and using an Inertia to activate it if I get rear ended, I have a fuel cell with rear ear exit fuel line where original tank was. (sorry no pic)
https://www.amazon.com/dp/B007N0GRIE/?tag=fabo03-20