I used option connectors on two of the Civics because they were easily available courtesy of the forum members, but on the Jazz with 4 USBs available there is no point to the 12V socket so just used that. I installed just like Nicksey's pics, virtually no wires visible, even for the rear camera, my 12V adapter just has a side cable exit on the passenger side tucked away, and a pass through USB power at the rear, so now three USBs at the front.