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Sub-placement isn't crucial because bass is non-directional (ie, your ears can't tell where its coming from). Whats far more crucial is balancing the placement of the four (six?) speaker/speaker-combos. Usually, the factory locations work well for this, at least in modern vehicles where acoustics are studied.
I have looked in to this too. JL makes a kit that places a 10" sub in the center console. You can go to their site and check it out. I think this is what I am going to do.
I have contacted JLAudio and they have spent time with me in custom making a sub box for 3 8's (8w6)...They are to go in the back behind the passengers rear folding seat. If you place them under the rear seat you will not be able to fold the seat down. Another suggestion that they made was to put 1 10' on the hump either in the front or in the rear between seats....Give JL a call and they can help you out with any questions you have.
Also heres an artical done in truckin' mag about a custom screw they put together.
http://www.truckinweb.com/0701feature01.shtml
Also a point on the box (ordered or custom built by yourself) you will need a sub that has a shallow mounting depth, this and cubic inches is what prevents most from having a good sounding 12". Precision Power makes a 12" sub called the PRO 12. It is a flat piston type sub that kicks #####, I have the 10"'s in my truck now (older f-150) and they can really punch you in the chest. They are clean sounding too no mushy "loose" bass. Some like the "loose" bass more than the crisp, solid, hit. But the mounting depth is only 4.25" vs a standard 12" may be 5-8" in depth way too much for a small box under a seat.
I've got a 6.5" RS Bazooka under the rear passenger seat (the smaller flip down) facing the door. It fits perfectly and sounds great. The cool thig is you can still fold down the larger side without removing the sub.
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