Which way should my port/subs face in trunk on my current build?

[TaurusBass1021]

Which way should I face my subs and port?

I am leaning towards firing the subs up and have the port firing to the rear? I currently do not have a design plan yet due to inexperience with designing a subwoofer box.

Also to save on box space would an aero port be more suitable for my box build and maybe be better than a slot port?

[afrakes]

I've always had the best results with sub back port back as long as there's a good 8-10" of clearance. Sub up makes the trunk lid rattle way to noticible in the cabin imo