flat mount requires the bolts to go into the caliper from underneath. so unless you have holes straight through the fork leg, you have to bolt the caliper to the adapter and then the adapter to the fork.
It's probably cool for rear calipers, but I honestly think it's inferior for (carbon) forks. (post mount is a bad enough idea in itself, but that's another story...)
flat mount requires the bolts to go into the caliper from underneath. so unless you have holes straight through the fork leg, you have to bolt the caliper to the adapter and then the adapter to the fork.

It's probably cool for rear calipers, but I honestly think it's inferior for (carbon) forks. (post mount is a bad enough idea in itself, but that's another story...)