I'm guessing the fork is the more important bit of this puzzle and most that are roady are firsty mount now. I'd just get some flat mount brakes, the pictured ones aren't anything special.
That was my general rant at the ever changing standards, flat mount offers cleaner lines and that's just about it, adds nothing else to ease of installation or performance.
Should have just stayed with IS or Post mount...
+user117538 if you plan to use the caliper in your second photo, you'll need a couple of adaptors like these https://www.merlincycles.com/trp-flat-mount-to-post-disc-brake-adaptor-89957.html