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I don't know how directional those Hertz tweeters are, but you may have off axis imaging problems with them pointing down at the same angle as the vent cover.
Depending on how deep the tweeter is, you can mount them in the A pillar plastic for great direction stability if you aren't happy with the vent location, or in the top of the door frame below the vent window (another good location).
Let us know how your location choice sounds when you get it up and running.