Running Plex in a docker container will be your best bet. After installing docker you can run a docker compose file that has your /config folder mapped to a separate location. Here is a sample compose file from the linuxserver.io group, which I highly recommend.
***
services:
plex:
image: lscr.io/linuxserver/plex:latest
container_name: plex
network_mode: host
environment:
- PUID=1000
- PGID=1000
- TZ=Etc/UTC
- VERSION=docker
- PLEX_CLAIM= #optional
volumes:
- /path/to/plex/library:/config
- /path/to/tvseries:/tv
- /path/to/movies:/movies
restart: unless-stopped
Pay special attention to the section marked "volumes" you'll see the first line is a mapping for the plex config from the host to inside the container. The left side of the ":" is the path as the host sees it, the right side is from inside the container. You can use this compose file in each installation of linux to share your config and watch history as plex will always find it in the /config folder. That's the beauty of containerization!
That being said I wouldn't run two containers at the same time. That could have unintended consequences as each may try to write to the same file at the same time. As long as only one instance of plex is using the config at a time you'll be alright. You can find more info about the compose file here!
If you have any questions, feel free to ask! ๐
I'm sorry, I'm either not that person or don't get the reference