Our Chrysler Voyager has 5 anchor points.....2 in first row, 3 in last row.
We had a Honday Odyssey last year with just 3 kids (1 on way), but had to sell, as anchor points on 1st passenger row, were above 2nd passengers head - roof anchor points. Not ideal for 4 children.

We had Ford with 3 car seats in the back for a while. 2 x MRs and 1 x rear facing SNS. Worked for 6 months....but didnt work when DD#3 needed to be turned around (13mths old).

Also gotta think past baby stage...ie when children older, they will no longer use carseat belt, they will require a lapsash??? having 3 car seats squeezed and wedged intogether, makes it almost impossible for mummy to get her hand down the side of the car seat to do the seat belt up for the older children....hope that just made sense LOL....