How can I sync these user folders? #SyncThing

Got two computers on LAN, each two users: jro & public

Each user has a ~/SYNC/ folder (example: /home/public/SYNC, /home/jro/SYNC).

The goal is that each user folder would sync, device-to-device. Device1:/home/public/SYNC <--> Device2:/home/public/SYNC

How can I set this up with SyncThing

Do I need to run one instance per user?

How can I run SyncThing as a user that's not logged in yet? #Systemd ?

Operating system: #Mint Debian #Linux