Looks to me like the tightest fit is forward of the fork on the front wheel. After you've extended the slot on that mount, you might pull the rear of the front fender in a half a cm or so. The fender will pivot around the fork mount which should give you a bit more clearance in front.

Fitting fenders can be a PITA. One of the posters here noted they charged time and material to install them, because they go on one bike in 20 minutes and the next time it's a 2-3 hour struggle.