What is Gateway Devices in Tuning Parameters?

I concern gateway devices in Tuning Parameters.

If it is enabled, what can it detect?
Why does it increase false positive?
Can I see the detections in Detection Catalog?

By default, gateway devices are ignored by rules-based detections because they can result in redundant or frequent detections.

Select this option to identify potential issues with gateway devices such as your firewalls, routers, and NAT gateways.