You want them both to have their own media server, and also have access to....yours? each others? Plex already does that with ease. I'm not really sure what the issue is?
Edit: ok read some of your replies and it's about your upload bandwidth. Have you even tried to see if it can handle it? Plex just takes care of all of that. If you're already going to be managing both of their servers and libraries, why not just ......... do that? don't bother with replicating etc - just set them both up with the *arrs and you manage them.
Huh? The first step is basically immediate generation of video that looks real.
What on earth are you talking about?