PRO covers up to 100 titles. Past that, pricing is quoted individually — presses, imprints, and prolific catalogs are all different, and a flat tier would treat them like they aren't.
Email hello@ai4dat.com with roughly how many titles you manage and where they're published. You'll get a real reply from the author.
Quotes apply to the 4DAT Author Operations Center app — not the SPARTAN CODE App, which is already on the App Store.