Car seat placement

Me

First time mom with newborn here soon! and I assumed the car seat would go in middle of car and my step daughter in booster seat would sit next on either side, my hubby said car seat on either side of car not in middle that when stepdaughter was a baby they had her on an outside seat with a headrest for the mirror as our middle seat has no way of attaching a mirror to see while driving ? Opinions please?

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