Ok no problem. You can put it to the back or side and the short space between the port and the wall will help with loading and it will drop the tuning a bit. I have my system subs up port back right now, 8 inch aero, tuned to 40 hz, firing back with around 1.5 inches space between it and the back of the trunk in my car, and it wangs pretty good from around 28-70 hz. With the SA's and decent power, it shouldn't hold you back to much though. Musical louder to the ear, I would go with port to the side or in the center between the subs firing up, metering volume, I have had more luck with port back tuned a bit higher than your looking for.
Here's a pic of what I'm running for reference since I doubt I made any sense above
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