I bought a Viofo A129 (front only) and willing to install it powered through the mic dome connection overhead. Viofo operates at 5v. Does anyone know a 12v to 5v converter with mini USB that is short (couple feet should be good) enough that can be tucked within the dome? Mine is a 2018 S with glass roof, so cannot have a cable with too much slack as there is not much space up there to tuck it in.