Ground Wire Mounting Points in Trunk?

[Cacfk7]

Hey guys, new member and new 10th gen civic owner here. I’m installing a subwoofer in my 2019 Civic Sport, where is the best spot to mount a ground wire in the trunk? Thank you.

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[TranceFC1]

I grounded mine under the rear seats when you take off the rear seats there's a bolt near the door and carpet area near the plastics that run up the rear side of the car. Left side