Are you trying to arrange your seats so that an adult can sit in one of the outboard seats?
Lots of small/medium SUVs will fit the bill, but you need to make sure that the manufacturer allows carseat use in the center position. A few don't allow it at all and others allow it, but recommend against it. You will definitely want to try your seat to make sure you can get a good center fit. Also, very few cars have LATCH in the center position, so you will almost certainly need to install the center seat with the belt.
Apart from that, I'd look for a car that has electronic stability control and side curtain airbags for all rows of passengers, preferably with a rollover sensor. Those are very important safety features and really essential in an SUV. Also, check out safety scores at
www.informedforlife.org. The Honda Pilot does well on that front, and several folks here really like it. If that's too big, check out the smaller ones like the CR-V, RAV-4, and Subaru Forester.