I started with triple monitor but got so annoyed by the bezels and the lack of immersion that I ditched the center screen and replaced with a nice 4k screen (PC monitor, not TV). I kept the side screens for maps, Teamspeak and Helios etc, which was (for me) much better than a cockpit view stretched artificially over 3 screens.
Then I got a rift and never was able to go back to flying in 2D with track IR. Its just so much better, and if you have a fully function real cockpit, imo, even more so a reason to use the rift, so you can reach for the actual knobs and buttons :)