[arpad_m]

I also have Gen5DIY's dual power harness that hooks into the overhead console (OnStar) for the 2016-2018, and it works perfectly, strongly recommended. No visible wiring except for the last two inches or so and the plugs, of course. I used dual sided tape to attach the dash cam to the windshield, while the radar detector is hanging on the Blendmount. The whole setup is nearly invisible from the outside, including the rear dash cam.

Their 2019+ variant connects to the HMI behind the pass side fender, because the overhead console has no juice left after the refresh, so a bit more work to install but it should work just as well.