That bike has Salsa's alternator dropouts, right? Im just guessing, but figure so since i assume its a new bike. If it has the alternator dropouts, i am pretty sure you are extremely limited in your potential rack selection. Like very limited.
Go to Salsa and look at the Alternator racks. pick whichever works.
rant time- Salsa decided to get cute and creative and innovative. Then Salsa had to create a specific product to work with the cute, creative, and innovative product since other options dont work. Time tested and basic is almost always best.