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You can run down the A-pillar area, after removing the external A-pillar trim. Of if you want to install in the rear and not afraid of drilling a few holes, you can remove the external D-pillar trim and bring the wires in that way. (I just did for two CB antennas.)

As for power, my suggestion would be to tap into a RAP (retained accessory power) circuit. That way the Sirius receiver stays on just like the radio will after the ignition is turned off. In each kick panel there is a big yellow wire for the door locks/windows, or there are some circuits for the rear wiper, heater, etc. that are on the RAP circuit.