I've installed a Viofo A119 into my front, waiting on a rear cam as well. Luckily my PIU had a bunch of leftover wires run across the head and floor liner from when it was decommissioned, so I'm trying to use those.
I used fuse taps to tap into fuse #36 for ACC power, and Fuse #11 for constant. this is for a 2014 PIU so it should be exactly what you're looking for. You can also easily tap into the A pillar if you don't care about removing it later