Here are some popular TP-Link NVR models:

• VIGI NVR1004H: A 4-channel NVR with 1080P resolution and H.265+ encoding.
• VIGI NVR1016H: A 16-channel NVR with 1080P resolution and H.265+ encoding.
• VIGI NVR2016H: A 16-channel NVR with 4K resolution and H.265+ encoding.
• VIGI NVR4032H: A 32-channel NVR for large-scale surveillance systems, with high-resolution recording and advanced features.

These NVRs offer a range of features, including:

• High-Resolution Recording: Clear and detailed video footage.
• H.265+ Compression: Efficient storage and bandwidth usage.
• PoE Support: Power over Ethernet for simplified installation.
• Remote Monitoring: Access your surveillance system from anywhere using a smartphone or computer.
• Motion Detection and Alerts: Receive notifications for suspicious activity.
• Two-Way Audio: Communicate with visitors or deter intruders.

ONVIF is a global standard that ensures interoperability between different brands of IP cameras, NVRs, and VMS. This allows for easier integration, flexible system design, and cost savings for users. By adhering to ONVIF standards, manufacturers ensure their products are compatible with a wide range of systems. Choosing ONVIF supported NVRs is critical for scalability in network setups.

The best choice between UNVR, UNVR Pro, and UDM-SE depends on your specific needs and budget. Here's a brief comparison:

**UNVR:**
* Ideal for small-scale setups.
* Offers basic recording and playback features.
* Budget-friendly option.

**UNVR Pro:**
* Suitable for larger-scale deployments.
* Supports higher resolution cameras and advanced analytics.
* Offers more flexibility and customization options.

**UDM-SE:**
* All-in-one security gateway with integrated NVR functionality.
* Provides comprehensive network security and management features.
* Ideal for home and small business environments.

If you primarily need a standalone NVR for basic surveillance, the UNVR or UNVR Pro might be sufficient. However, if you require a more comprehensive security solution with features like network security, firewall, and VPN, the UDM-SE could be a better choice.