How do you power those guys?
Well, they give you a really long power cord with a cigarette lighter adapter. For now, I've just trained the wire over top of the passenger visor, down behind the rubber on the A-pillar, then under the passenger floor mat.
My car (an earlier model) has an unused 12v connector up under the microphone piece which I intend to tap into with an in-line fuse holder and a short piece of wire tucked behind the headliner.
That wire was there from when Tesla planned on upgrading the visors with illuminated mirrors. Tesla has since backed away from that commitment and later models no longer have that 12v wire.
Here's a picture that I downloaded from another post a while back so I'd know what to look for: