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All real jeeps have 4WD Its only on the recent generation, the JKs that 2WD is offered.
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hey!
Your boat tail will not do anything if there is no air flow attachment. Jeeps have such a high windshield angle, that the air doesn't re-attach to the roof of your jeep, and just whooshes upward into the sky, as you can tell during the rain

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Have you ever thought of a moon/sun visor? they go on top of the roof at the windshield, and the air hits the visor, and re-directs the air to the top. AndLund moon/sun visors have a patented air flow design for improved aerodynamics. Although what makes it patented I don't know, but it definitely isn't solid and lets air through.

It's mounted on what i *think* is a ZJ. I of course, wouldn't pay the money for one, and I'd just home brew my own. Might not look the best but, it would0 save quite a bit of cash. I'd extend it more rearward, it looks to not redirect the air enough.
I'd make one if I were you, only i wouldn't make it permanent. I'd make the most out of your boat-tail.