A typical widescreen monitor give you an aspect ratio of 1.6. Flip three of those into portrait mode and put them next to each other and you wind up with an aspect ratio of 1.875. This is hardly any wider than the single screen, and now you've got two bezels that are pretty close to each other.
Besides the lack of expanded FOV that this setup would give you, you'd also have to deal with non-centered HUD issues that, in general, haven't been solved for the 0.625 (1200/1920) center screen aspect ratio.
Just pontificating... five 24" monitors in portrait mode would result in 6000x1920, which is an aspect ratio of 3.125. This might be a useful setup for some who want the screen real estate but can't fit 8-9 feet of monitor length in front of the computer; the 5-portrait setup is "only" about 5.5 feet long.
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