How to hide WordPress users’ names externally?

I have several users creating posts in WordPress, but I don’t want any of their names to appear publicly. On the site, I want it to only say By: Website Editor.

This also means that the names should not appear in any other related URLs, for example author URLs. If someone were to visit www.example.com/?author=3 for example, it should not reveal any names. I don’t mind disabling author URLs completely if that’s easier to do.

The SEO plugin I use also shows the name of the author in the source, that’s gotta go away also.

And in the backend, the names should appear just like usual.

How could I achieve this?

Thanks!