our yard is in a residential neighborhood so we have killswitches for the backup beeper. I had them installed in the back near the wiring for the beeper it's self. They're usually connected to the backup-lights circuit so you'd have to run fresh wiring from the dash back to power it separately with a relay. Having the switch back there is fine as usually we don't need to turn it off and hopping out to go disable it isn't too big a hassle a couple times a year.