X-Large Rental Car Options?

Hi, all! Traveling to Galicia in August as we do (almost) every year, but will be bringing some friends and family along. Any tips/recommendations for a rental car or van that will comfortably seat 6 adults plus a bunch of luggage? We have never run into this issue before as it's usually just us (2 adults) or a small group. Are there even any options for cars of this size in Spain? If so, would we find somewhere to park it?

Appreciate your insight!