@Spinter...
You can buy a flush mount USB with RCA & 3.5mm extension cable to extend the USB connection, just turn the mount horizontal and mount it as you would a switch.
Clicky Me...
... or round version
HERE...
You can also buy round fitment with HDMI conversion.
HERE...
They all plug into the rear USB input on the RunGrace unit, you can also use the red/white audio RCA's.