Yeah, my biggest questions were also legallity, rain and night. As for location, i'd honestly opt to mount them over my wheels in a little "bubble". You'd get much better visibility of the cars beside me (no more blidspot).
My neck still works, so i'm not concerned about stuff like getting out of the car on a busy street.
Power consumption... good question. I would expect very little, but I will look up some stats on wattage for a small screen and a camera.
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