the box i built for my old 13w7 was 2.9cu ft before sub displacement tuned to 28hz. those subs love to be tuned low.
There is no reason why u cant fire downward. Leave urself about 4" of clearance as they have a good amount of excursion. Definitively go ported.. port firing back or to the side, i wouldnt fire the port at the floor.
2005 Buick LaCrosse
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HU: Alpine INE-S920HD
SUBSTAGE: DD 9512f's on a CT Sounds 7k, 10" aero
F/R STAGE: Rockford Pro mids and supertweeters Rockford T400-4
ELECTRICAL: JS Ultimate 300a 6 phase, few batteries, welding wire