I would be very surprised if you have more than two anchor points in your car as they don't put the, in behind a split fold. You cannot safely install a child seat over a split. The new patrol still only has the two anchor points so. Wold say yours is the same.
So Melbel is the split in the middle of the seat or between the seats IYKWIM? I have just bought a Commodore wagon, the seats split to fold down, but I think there is a factory anchor behind the seat that splits, so the middle seat. The split is between the middle and passenger side seats. So the seat wouldn't sit on/or over the split it's self. Is that the same or different to the 4wds do you know?
I will go and check the anchors as soon as I can muster some energy