For many brands the top end MTB shoes are the same as the road shoes, but with different drillings and a treaded sole for walking.
I use
Sidi Dominators, available up to size 52, and without the mesh top panels that let in the cooling breeze and the rain. These are pretty much the same as the
Sidi Genius road shoe (that has mesh though, roadies don't care about getting wet feet). Note that Sidi do wide fitting versions (Mega) of many of their shoes.
I would say that if you are going to do much walking, then MTB-ified versions of road shoes aren't necessarily a good thing, as the soles can be too stiff for good walking. They are fine for round the supermarket, but you may not like to do much more than a couple of miles of tarmac walking in them.