Ring Alarm and Eero 6E

Hi, I want to upgrade my home network and interested in Eero 6E network. I see the Ring Pro has a built in Eero 6 which after reading around I learned that I shouldn’t be using that as extender for my network. My question: If I get Ring alarm (not pro) and Eero 66E, then subscribe to Ring Pro (which offers Eero secure) can I use the Eero secure with my Eero 6E, or I must have Ring Pro base station in order to use the Eero secure? I find it annoying that I pay for both subscriptions (Ring Plus and Eero Pro) while I really don’t need the extra features that comes with Eero plus, comparing to Eero secure. Thanks