The fenders are going to mount where they're going to mount. That's determined by the frame and fork. So the question really is, "How big a tire can I run under my fenders?" Simple- experiment. I've seen road bike fender clearances of as little as 1/8". I like more, as above, maybe 6mm minimum, for the reasons given above. Thing is, you don't really know how big a tire is until you inflate it on your rim. It'll still grow a bit for a few days. OTOH, maybe the OP has the tires and wonders if they can run fenders over them. Try.
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