Generally, ISOFIX low anchorages are located on the two outer seating positions in the second row, and not in the middle seating position.
If you wish to use the middle seating position in the second row, you can still fit an ISOFIX compatible child car seat in the middle position by using the vehicle seatbelt and top tether strap.
It is not recommended to have aftermarket ISOFIX low anchorages fitted.