No reason to have wires running all over the cabin. You can get an add-a-circuit fuse adaptor:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
And connect it to a USB power convertor:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Easy to run the wire directly from the fuse box behind the glovebox up the A pillar and under the front of your headliner, and you also get the benefit of having the cam on a separate fused circuit. Works well for a radar detector too.