So how does the new ADFS licensing work?

if your using ADFS on a DC its covered under the normal DC license?

if your ADFS is on a member server, you need to buy a Member server addon?

https://www.manageengine.com/products/active-directory-audit/pricing-details.html#compare?lhs   shows ADFS as included in Professional, bit how do you actually configure it when you have no member licenses?