Where do you usually mount your GPS (or where would you want to)?

I mounted an additional 12v plug in the map pocket of my S70 plus one in the trunk liner. The ones up front can feed a GPS, Sat radio, Bluetooth earpiece, phone charger or whatever sitting in the map pocket or mounted to a Panavise mount to the right of the radio.

I ran all the wiring while the dash was out for the dreaded mount repairs. I also had to pull the fusebox to replace a broken lower relay panel. I had a fusebox from a wrecked C70 off eBay for the lower panel and it came with all the fuses, circuit breakers, and a few relays too. I wired the new accessories to a unused, constant 12v fuse source intended for a block heater. That circuit splits, with one going to the trunk and one to the right side of the dash via the big bundle at the base of the windshield. They each have their own relay (aftermarket) and circuit breaker (Volvo), and are energized from a rebadged rear foglight switch in the dash. the relays and circuit breakers are all in the lower relay panel just like the stock electrical system. I put a custom yellow LED and resistor in the switch to remind me when it is on since it works without the key. All wiring connects are soldered and covered with heatshrink tubing. Works great and can safely handle more power than the stock console sockets. But I wouldn't have done it quite that well if I didn't already have the dash out and the interior stripped to put in dynamat and the trunk mounted amp, speakers and wiring. To be honest, if the dash didn't have to come out, I'd still be using an aftermarket splitter. What I have now is worlds safer and far more integrated and convenient but it also wasn't truly necessary.

I'd wire for 12v plugs and just use a flush mount USB adapter when and where it's most convenient. I have one circuit for my extra front sockets, they're just wired in series with a 20 amp value on the circuit breaker and fuse. The rear just got one plug but I can always add another back there in the same fashion. I just figured that single socket at the rear might need to pull more juice for a 12v cooler on a road trip.