Terminator X Hole Through the Firewall

Heys guys I am looking for any advice on where to mount the Terminator X inside my 73 Duster. I don't want it in the engine compartment. I've heard next to the heater box. But maybe more importantly want the most ideal spot to go through the firewall. Has anyone done this?
I am going to mount all its fuse box etc all in the glove box so its easily assessable. I will bring the loom through in the most stealth position i can to avoid clutter. Ill figure this out when i dry fit the motor