I have front and rear dashcams in my insight. There is a single wire running form the power outlet in the console. I removed the leahter trim on the dash and was able to run the wire within the console into the battery area. It is split there into two USB connections. One runs the front camera, and the other runs to the rear camera underneath the floor mats and under the rear seat and up the passenger side rear. I'm happy with the results. Let me know if you would like photos of the install.
Post the install pics.