I know this is such a minor thing, but I have my administrator ask each time which website is coming up for renewal.
We have an internal spreadsheet for these things, but we're looking to host 20+ websites before the end of the year and we'll keep having to triple check this information with the correct website.
All it needs is either the Webflow site title or the domain it's connected to.
I don't know if there's any reason why it shouldn't be there, but it just helps quickly reference the reminder emails to something.