I'm going to assume you have a non-nav version. If you have navigation, things can get a bit more tricky.
1) Yes, get a LOC (line out converter), and add the amp and sub.
2) WickedCAS enclosures are pretty nice, but they are a bit expensive. This is in part because the enclosures are a massive pain to make. The enclosure will limit you to a 10" subwoofer, which may or may not satisfy you. I forget what the volume of the enclosure is as well, which may not match well with the sub you choose.
3) Best for the car is subjective. How much bass do you like? Two 12" subs is overkill for most people. I would recommend one 12" subwoofer as it should provide enough bass, will hit the lowest frequencies better than a 10" (all else equal), and you can always dial back the bass if you think there's too much.
At one point, I ran two 8" subwoofers (both powered by a zapco ST-850XM amp) in the hatch at one point, and I could get the hairs on my arms nearly standing up. I'm currently running one 10" sub, which sounds good, but doesn't really hit the lowest frequencies (< 30 hz) well. But unless you're trying to win sound competitions or have a really good ear, it's unlikely that this issue will matter to you.
Nonetheless, you really can't go wrong with a 12". A 10" will probably be fine, but I think a 12" would be a little bit more versatile for the reasons stated above. The zenclosure is also much cheaper than a wickedCAS enclosure.
If you want to keep the hatch space though, your basic options are to either (1) use the wickedCAS enclosure, or (2) ditch the spare tire in the hatch and build enclosures beneath the hatch floor.
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