How to setup Suricata-IDS between a Device and a server?

I want to setup Suricata-IDS between a device like Firewall and a web server. Something like below:

Internet → Firewall → Suricata-IDS → Apache

The Firewall IP address is, Suricata-IDS IP address is and Apache IP address is .
Which parts of Suricata-IDS configuration file must be changed?
@ish wrote a very nice article about setup Suricata-IDS in IPS mode step by step and I’m thankful if anyone write a good article like that about this scenario.

Thank you so much.

Excuse me, I can’t understand you mean!!