My first thought was, "How do you know these are the best?"
And my second thought was, "Why does the best environment for ergonomically sound computer use as I've always seen it mentioned, involve a combination of chair, desk, monitor, and posture, all individually adjusted?"
And then, "What is it about both the standard ergonomic advice, and these alternatives, that make them the suggested 'best' setup? Are there elements which apply across all environments? And since a good chair, used properly, provides all the support we need, yet so many people still end up slouching, is it possible to damage yourself regardless of what you're sitting on?"
Exercise balls were banned at my previous workplace because of reports of people falling off them and hurting themselves.
Anyway, I know I sound skeptical, but that's because your post claims to list the best ways to sit at your computer, but doesn't offer any reasons for
why they're the best ways.