The "Synology Surveillance Station license free" dream is real only up to 2 cameras. For anything beyond that, you are either buying hardware (second NAS) or paying for software.

Each regular and panoramic camera requires one license only. Surveillance Station | Synology Inc.

In 2023, Synology launched its own line of hardware, such as the IP cameras. License-Free Integration: These cameras do not require a license to use with Surveillance Station. Cost Efficiency: