We have 3 separate web applications that we’re trying to secure with Auth0 universal login using a custom domain (ex. https://accounts.company.com). The question should these 3 separate applications have their own applications in Auth0? ex. app-a → application a (Auth0), app-b → application b (Auth0), etc… Also, if they need to be setup as separate applications in Auth0, can they share the same login domain?