I think corner reflections depend on the angle. Ditto the recommendation to watch Russ Barlow’s video, he recommends using a 60 degree angle (physical angle of one screen to another) and a 60 degree Field of View, and then you have a 180 degree total view if you sit in the right place. I don’t have 3 monitors yet, but I have seen some videos of people using 3 at 90 degrees to each other, and yeah, the relection looks not great, but I think 60 degrees or so would be much less of an issue, if at all.
