Manage two PMS servers different Synology DS218Play and DS220+

Server Version#: DSM7
DS220+ Plex Version#: 1.25.5.5492-7000
DS218Play Plex Version#: 1.25.5.5492-7000
How do you manage both from one account.
Only see one device.
When I log into the new server all I see is the old server.

I’ll start with a strategy question. Why not just have one server that uses the files from both NAS devices? (One can access the contents of the other).

Building a new one on the 220+.
Make sure it is working
Get it working then rebuild the NAS.
Have users in other places connected to old one, then switchover to new one