Help needed setting up Cloudflare Restoring original visitor IPs

I need to set up the “Restoring original visitor IPs” (https://support.cloudflare.com/hc/en-us/articles/200170786#C5XWe97z77b3XZV), but the Cloudflare instructions to set up this solution aren’t very clear.
Since Cloudflare no longer maintains the mod_cloudflare, I only have to set up the mod_remoteip, right?
In addition, what are the “Web Server Instructions” for? If I already enabled and configured mod_remoteip, I don’t have to follow the “Web Server Instructions” or the " Restoring original visitor IP with HAProxy," right?

A post was merged into an existing topic: Cloudflare isn’t protecting the site, causing security to block IPs and then 521 error, how to fix?