K12 wiring route for 6x9

Before I go out and start pulling trim apart, does anyone know what the best route for wiring 6x9s to the rear shelf?

Assuming I take the wires from the existing door speakers in rear.

Thanks
 
If you have a 5 door the rear door speaker wires are located under the lower pillar trim. Drivers side is (iirc) light green and grey, and passengers side is red and white (both with grey dash markers). If you need more info just ask
 
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