agree with other responses. space is tight (function of what kind of car seats you have), so it's better for a skinny person that is also isn't very tall (reduced legroom given armrest console). You can try to put both car seats side by side, but that may be a tight fit or impossible.
I consider that middle seat the 7th seat in the car, so I'd put two adults in the 3rd row before putting one in that seat.