Power down one side of the floor, signal cables down the other side.
You want them as far away from each other as possible.
That's the right way to run wires any vehicle, not just your BMW.
here's the question:
What's the best route to get:
1x XGA cable
3x USB cables
2x 8-wire computer cables
13 radio extention wires
from the trunk to the center console on an E46 BMW coupe??
Carputer along with radio will be in trunk and radio face with TFT and USB on the center console.