I bought these fenders recently:
The rear fender works fine — there are enough mount points to support my brake, kickstand, rack, and fender.
But when the salesperson sold me the fenders, we both failed to realize that my bike's front brake uses both of the mounting holes available on the left side of the fork:
I went back to the bike shop, talked to a tech and he gave me a longer bolt, recommending that I just mount the fender stay on the outside of the front brake (with some washers surrounding it). But when I asked at another bike shop, someone told me to definitely not try mounting them on the same bolt.
Could mounting them together cause any problems with brake alignment or reliability, or is it fairly safe?