I have purchased from Ebay, a 12v to 5v adapter, that has micro usb connector and I have it in front of my sunglass holder. There is some space, that can be used for such things. http://www.ebay.com/itm/Car-Charger...hash=item1c7d20c6eb:m:mH9jcGe9CEfQFR9hR0N3adA
I have also installed, my own auto dimming mirror(Gentex) and I took the 12V, from the mirror connector.