Seriously, as I've mentioned in the comments there, this might be the most impressive things about PC2 I've seen so far. I'm not aware of any other game offering this level of adjustment (but granted, I'm not all too familiar with triples, so maybe it is possible with other games somehow):
Source: https://www.reddit.com/r/simracing/comments/73djxi/project_cars_2_has_great_triple_screen_support/
Source: https://www.reddit.com/r/simracing/comments/73djxi/project_cars_2_has_great_triple_screen_support/