Cloudflare for SaaS

My SaaS, saas.com, allows users to pick a subdomain from a list of predefined domains (a.com, b.com, and dozens more). They can also bring their own domain. In other words:

  1. *.saas.com is only used for the SaaS—no UGC (user-generated content)—e.g. the root is for the homepage, while help.saas.com for knowledge base.
  2. a.com/b.com redirects to saas.com a.k.a the homepage. Someday they might have their own landing page instead of redirecting.
  3. *.a.com and *.b.com are for users. They can pick anything e.g. bla.b.com as long as it's available, not used by other users.
  4. They can also bring their own domain, e.g. sub.myco.com.
  5. They can also choose nothing. Which means their UCG will be available from the root of a.com/b.com, e.g. a.com/my-ucg. This is the default.
Given those requirements, my first question: Where should I enable the "Cloudflare for SaaS" feature? In saas.com? Or in either a.com/b.com?

FYI, saas.com, a.com and b.com are all managed in Cloudflare under one account (e.g. admin@saas.com).
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