I ran the wires in the Trans tunnel where the factory wires are going to the seat for future heating. Be careful if you put the switches where I did. There are wires behind so you need to pull the radio out to drill the holes. Enlarge the hole slowly not to oversize it and they push in snug. Slow works here really well.
In the Trans tunnel there is box tubing to run behind. Also wire tie it to prevent touching Trans due to heat. Under your seats wire tie the wires up off the floor in case of water .