I have a 2015 Janis Renegade Expert, which is, more or less, a carbon frame gravel bike. I tried putting a rear rack on it, (along with a handlebar roll, a full frame bag + bikepacking saddle bag), and the weight played havoc with the bike handling. Rated for "light touring", there is definitely a reason that you aren't provided with rack attachment points. Figure out how to pack light, then think about what bags you can strap directly to the bike. Forget about the racks for this bike.
If you absolutely, positively must carry a bunch of gear and supplies (food and water are surprisingly heavy), consider an ExtraWheel trailer and put your panniers on that.