That link could be classed as a competitor, might want to remove it.
Unknownsock - It actually states in the description "if your monitors are wider than 30cm/ea or larger than 15" in nominal size , you will need to buy two additional long arms modules"
And I'll agree, 3 in portrait for gaming just doesn't look good imo.
Edit: Just looked on Ergotron site and the only stands that can do tripple monitors that are desk mounts are
This and
This and neither can do tripple 24". Personally I'd go with one to do two screens, and then another stand for the last one, however as I've never used monitor arms/mounts before, I can't give advice on what ones to choose, only that Ergotron seem to be looked at at high quality.