I have the EezRV and put the booster on the back wall of the battery compartment. I kept losing the RR tire and my spare on the rig. I have a battery disconnect on the top of the battery compartment, so I didn't bother wiring in a switch. The repeater is on whenever the battery is on. I bought the repeater on Amazon. The new one apparent comes with an inline switch now.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1