Same LAN for WAF and applications?

[petr-larin]

Dear All,

This is what I read on the internet:

SafeLine must be installed on the same server as your website to monitor and protect its traffic effectively. If your WAF is on server A, it can’t protect sites on server B unless both are within the same local network.

[Source] (https://medium.com/@lulu.liu12345/comprehensive-guide-to-installing-configuring-and-testing-safeline-waf-ec0914884a36)

I have not found this requirement in the official docs...can you please confirm or disprove it?

Many thanks in advance!