You can Live link multiple Scalers. Under the Logo on the upper left choose sync.
You can choose how Scaler will sync to others. Live Sync will make the one you have open the Leader and all others will be followers. You make changes only on the Leader or it will break sync.
All Scalers will follow everything in the Leader. If you want only certain things to sync but want each to have their own Expression playing then check the boxes of what should sync.