I want to begin by saying I've read the documentation. I'm sure many do not, and I can imagine how annoying that is.
That said, there is a lot of information, and I wanted to confirm that I've understood it correctly.
My company has two Windows servers that run our applications, and we have an nginx server used solely to host the Joomla front end. All sit behind a load balancer.
I have not successfully gotten the nginx config to use the X-Forwarded-For header (my experience is with htaccess and web.config). But based on your documentation, it may not be necessary if I enable the global Joomla config "behind load balancer" - is that correct? That's the part that I am unclear about.