More space needed – VW T5 Multivan or VW Sharan or Seat Alhambra

Hello! We expect our third child in autumn and probably need a bigger car. As a rule we will be on the road as follows: – 2 adults – 3 children (1x Maxi Cosi and two child seats for 8 year old twins) – dog with box (approx. 80x60x60) – pram for the baby Currently we drive a Seat Altea XL which should become too small. At the T5 Multivan there should be no problems from the place. He would be my favorite, only the woman is not quite sure if they can cope with it. As an alternative, a Sharan or Alhambra would be possible. In principle, I don’t want to let the three kids sit side by side in the second row, this will simply be too loud and with the Maxi Cosi in the middle certainly not easy to strap on. Therefore, I would like to release in the middle and put one of the two twins in the third row (like them also good). Only then the space in the trunk is sufficient for dog box and prams if necessary. a small purchase? Maybe one or the other of you has a similar process behind it. I would be very happy about help! Oh yes, budget is so at 25-30K. Best regards Christian