Renting an Estate Wagon in France

My family of 5 (two adults, two teenage girls, one 11 year old) will be going to France this summer. Our son is just big enough not to need a car seat. We want to keep the luggage to a minimum since we are going for a week and are staying in places that have a washer and drier. But I still expect to have 4-5 smallish pieces of luggage (say roller bags that could be checked or a weekend type duffel). I am trying to decide between an estate wagon and an intermediate SUV. The wagons listed are the Corolla Estate or the Opel Astra Estate. Since you do not see those vehicles in the USA and I am having trouble finding good information on the dimensions/shoulder room on those body styles. I was wondering if any posters had insight on whether the wagons would work for my group. I would rather go with the wagon if it would not be too cramped, because one of the SUVs listed in the intermediate class is the Toyota C-HR, which seems to have much too small a cargo area for our needs. I could chance it on getting one of the other cars in the class (all of which I feel pretty comfortable would fit our needs), but I would rather just book the estate and not worry about it if the wagons are suitable.