Hectorsdad and Judith, thank you both immensely for your very valuable insights.
Our 3 teenage kids can't stand long drives (in their book, over two hours) . I guess I could stretch it to choose Narbonne as our base in France. I'll discuss this with the family and see how it flies. A possible issue, there appear to be relatively few hotels there, pricier too (quck Booking.com search), compared to Braziers.
Might I also ask for restaurant recommendations in the area?
Re tolls on French motorways, can one pay with debit card or cash?
Regarding the coastal areas from Narbonne down to Girona: do you think they'd be 'fully' crowded around 10/7? I prefer to avoid large crowds if possible (understanding I can't expect to have my cake and eat it too travelling in mid-July, if it follows the post-pandemic travel spree of 2022)