Sorry if this has already been asked, but I am wondering if I can use the Deco x20 without a separate router? I'm setting up fibre for an elderly friend and her place is tiny, so a WIFI router AND the two Deco's is overkill. Since she can get the Deco's free from Vodafone it seems to make sense, and save her a bit of money, if I can plug one of them directly into the ONT. Will it work that way?