Yes you can fit a booster between two car seats. The details matter though. I have 3 kids and purposefully got diono radian 3xt so three can fit in a row. I can try to find a picture for you later. If the max width of both seats are somewhere in the 15 range. You are good. Then the order issue is access to seat belts and how the seats are anchored. Isofix vs seatbelt based on child’s weights.
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