I know you said they're overkill, but I use these and are quite pleased with them. I've got two holding 27"s
In that situation I would recommend single monitor arm mounts for each monitor. I just bought VIVO monitor arms on amazon and i bought one for each monitor so that I wouldn't have issues with the weights. Gives you a lot of flexibility for adjusting them to align up perfectly too. Or you could get a dual arm mount, and then a single mount for the 3rd monitor.