Here is my blackvue mounted on a 8th gen civic. Unfortunately the civic wipers wipe inside out so you get a huge dirt spot and water build up right behind the rear view mirror.
I mounted it slightly to the left to avoid the dirt in the video and also a picture of the fuse box. There was a ton of unused slots so I used a couple of
THESE to hard wire in the power magic. One goes to ACC and the other goes to constant 12V.