There are 2 vent holes with flaps in your trunk. You have to unclip your interior trim to get to them. I would not recommend many other places to run it as it would risk water getting in if you don't know what you're doing. If you think you can get the wire to follow the license plate lights (straight shot), get a metal coat hanger and tape your wire to it in such a manner that won't damage the wire or anything you poke.
"We live for a good time, not a long time."
RIP Colin McRae