I am adding a few extra 12V accessory chargers inside my VX and am a little unsure of where to tap off the battery power. Should I attach the positive wire directly to the battery terminal (under the hood) or use a wire behind the dash? I am looking to add 5 of these 12V chargers (some in front/rear) and want them to not turn off with the car so that I could charge things when the car is off. Each 12V charger will have its own switch that can be turned off via a switch panel I am making and will mount inside the car. I am also going to add an additional dome light in the rear using the same method. Do I need to add a power cable for each 12V charger with an inline fuse or can I run a single cable from the battery to the interior and use it as my + line? Thanks!