I have mine directly in the middle under the rearview mirror. Here’s the driver and passenger view. From the driver side, you don’t see any wires or adapter. And you still have access to the dash cam’s buttons and screen.
I have my Dongar up high in the dots next to the plastic cover. My Garmin MIni 2 is attached to the dots, but the lens is looking just below them. Nice and tidy.