Hi Miha
The integrated child seats are only available on the two outer second row seats even on the very latest Sharan in which case they do not have the Isofix fitting. I can tell you from my own experience with my grandaughter that Isofix on the centre seat is very useful and she loves it as she can see out of the windscreen and gives me a running commentary as we drive along. The middle seat is quite different to the outers so doubt an outer seat would fit.
Gra