The floor is essentially flat right up to the brackets for the second row seats. I would double check the clearance under the back of the seat with it raised and 'ocked before extending any added floor under the seat. And there would be a two levels if you rwmoved the third row but left in the second row. The TC actually has a nice flat floor woth both rows in and it just costs you 6 inches of height. If it were me, I would either keep both rows or loose both rows. And if you still want the stronger, smoother floor it can still be installed on top of the laid down seats. And strategic hinge placement would still allow raising the second row.