High availability Implementation for Appian 17.3

Hi,

I want to implement an high availibility environment with the new Appian version 17.3 with 

2 web server

2 app server

2 appian engine

However, I know previously there was a link to perform configurations on servers but it is not available anymore.

https://forum.appian.com/suite/help/7.10/High_Availability_and_Disaster_Recovery_Configurations.html

Can you please tell me all the specific configurations to perform on web server and app server side .

I have already take in account everything specified in https://docs.appian.com/suite/help/17.3/High_Availability_and_Distributed_Installations.html

but is there any additional files to update ?

Thanks in advance for your help