I have a Vantrue N4 running through the USB behind the rearview mirror. It's nice, but I might have consider a different one if I hadn't already bought this one.
Fitcamx ....... because it looks like a factory install - no visible wires
I replaced my first dash cam, after being asked by a fellow in a parking lot, which "brand" of dash cam I had installed. After talking with him, I think he was "interested" in a camera and mine caught his "attention", stuck on the windshield.
I have a Blackvue Elite 10, front and back. I am using the OEM power source cable. Works great. I have the front mounted right under the mirror, the back dead center on the top of the rear glass.