Shell Cottage Outskirts of Tinworth, Cornwall, England Shell Cottage is the home of Bill Weasley and Fleur Delacour, after their marriage in the summer of 1997. It is located on the outskirts of Tinworth, Cornwall, near the coast, and is described as a "lonely and beautiful place." Sea Lavender can be found growing around it. It was a safehouse for various members of the Weasley family and other allies of the Order of the Phoenix during the height of the Second Wizarding War.
I mean according to JK Rowling and her story behind Ilvermorny started that's quite possible, for Slytherin at least. ANd personally I like that Hufflepuff reps Wales because I'm a little bit of Welsh descent