I mounted a 30amp 12v LED switch in my glove box similar as
this link, but use following circuit diagram:
This allow my both front & rear power outlet to be switched off when I don't need to use it, & switched on when I need them. I feel it is safer to ensure there is no power supplied to any power outlet unless the switch is turn on, than leave them on all the time.
Remember to remove 15amp fuse used for the front power outlet. If you leave the fuse in, it will draw power backward from battery through this link to all accessory/equipment turn on when ignition is on, even with no key inserted in ignition. This may caused potential electrical hazard due to potential wire current overload.