Should I bother with rear 6x9s?

[yo scotti 10+ year member]

I got the option to either get a sealed box that goes under my rear seat that houses two twelves or one that houses two twelves and two 6x9s in the center. Should I bother getting the one with 6x9 holes cut out? I would probably just get some Kicker KS 6x9s and hook them up to my head unit. The head unit is a JVC AR560 (50x4 watt amp). So should I bother, would they be that loud hooked up to head unit?

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