I have a Rexing V1 dashboard camera attached to my windshield behind the rearview mirror. To conceal and secure the power wire, I'm basically following this recommendation from roadlens.com. The wire runs along the roof to the windshield edge, is tucked under the windshield lip down towards the glove box, and under the passenger floor mat to the center console power outlet. I will be sure to keep the cable out of the way...
Tucking and securing the power cable for my dashboard camera
Tucking and securing the power cable for my dashboard camera