the streamer is hidden in the panel above the passengers right knee. (tried to reply earlier, post never appeared) I hardwired to the volume control via a phono to mini jack. then an adapter for music & usb charging. subsequently replaced with a quad lock mag charger (for charging)& music out via the bottom connector. I prefer the volume control rather that using iPhone buttons. streamer wasnt very good. I had the Kenwood system ripped out as it was pretty poor. .. depends how much you enjoy your tunes I suppose.
I started removing/loosening the panels under the dash from where the door hinge is .. fairly straightforward.