Universal login Vs. embedded for multitenant web app

We have a multi-tenant application where some of our tenants require SSO and for the other users we would like to activate MFA.
Today we are using universal login where each tenant has its own vanity url (https://tenant-x.mysite.com) but we see a lot of issue with users that either forget their tenant url or add Auth0 login page to their favorites because it’s the first page that they get when connecting to our app.
We wanted to change the login experience so that users input their email and then can be redirected to the proper tenant and were wondering if there is an option to keep using universal login with it or that we need to switch to embedded?