Subwoofer installation in 2009 Ford Taurus SEL?

Need some help finding where to break through the firewall in 2009 Ford Taurus sel to run a wore through… HUGE nOOb on this topic so any tips are appreciated. But my main concern is finding a place to break through because I can't seem to find one, thanks!

Right ( +/- ) under the steering column is a large main electrical plug. There's a rubber gasket that seals around the plug - Go thru that gasket.

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