Hi there,
if I were you I would try them as passive woofers, in a 3 way set-up with the mids and tweeters in front doors, or with a coaxial in the front doors.
I would go with a 120hz - 150hz crossover point.
Give them a shot, if they don't satisfy your needs, you can swap them with some nice hertz shallow mount woofers.
Max
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