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https://www.prendas.co.uk/products/prendas-ciclismo-winter-airtunnel-overshoes?_pos=5&_sid=00c336bf0&_ss=r - these are the only overshoes I've found that really stand up to proper rain and low temps. They're a bastard to get on and, like all of them, they do tend to fall apart after a year's use, but at least they work when they are being used... it's neoprene, so stretchy, and the XXL ones are VERY big. I'm a UK 11 and had to swap them for the XL, which are still pretty big...
I have those too, but there was just so much water on the road and splashing from all sides that I might as well not have... :/
With regards to the Velotozes, from what I can see their maximum size isn't big enough for my kayak-sized shoes. The ones I have now (Endura MTB covers) are already a real struggle to put on...