[scratch113]

Difficult - you might be better off putting one of the isofix seats in the front, assuming you have isofix on the front passenger seat? Think it might be an option on some models and in some markets?

Also, do be aware that the 3rd row isn't officially homologated for any kids' seats, even booster ones. I'm fairly certain that's because the headrests interfere with any backrest of the child seat, but you can get round this by removing the headrest and fitting them the other way round (i.e. pointing towards the rear of the car). There are a few threads here about doing that.

Then again I coped with twins in the back of an Audi A5 coupe until they were 6, so if you want difficult, try that! At least my wife had a VW Touran at the time.

 

[scratch113]

Currently in my Tiguan allspace if I have to car seats in the 2nd row then I fold the middle seat down for 3rd row child access

Yep, some of the VW products are a little more flexible in that the middle row is made up of 3 individual seats. Touran is the same.