Expecting baby number 3

So I drive a 4 runner TRD pro which I don’t think is possible to install a 3rd row in. I could be wrong. I need to fit 3 car seats in the back of my car. Which car seats are slim enough for that? 1 will be FF and 2 will be RF. For a little bit I will have the Nuna Pipa for the new baby.

If all else fails, we may trade in our sedan and get a bigger family car. What car would you recommend that can fit 3 car seats in one row or has 2 rows?