I vote forward and sealed from my own experiences as well. Tested many boxes in my car and that's what I still use to this day.
One thing about sealing off though that a lot of people miss is it's not just sealing around the box. Rear deck, b-pillars, c-pillars (sides of rear window), inside of door sills, top channels above door openings, etc. All those places give pressure channels back into the trunk.
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|2011 Toyota Carolla S |2 Mmats HD4000.1's | Pair DC XL 12's w/AR cones | Average headrest score out of the trunk...will update after world finals