the issue of whether or not the LX triple Mount Stand can handle 3x22 in screens...
Yes, thanks for raising this issue. The response you got from the Ergotron tech is as I understand it. You have to check the width and *depth* of your candidate (or actual) 22" against the maximum specs of the LX triple Mount stand.
Fortunately you can just check this online.
From the
Ergotron LX Triple/Dual Display Lift Stand Dimensional illustrations (PDF) one can see, for example,
you can have a maximum width of 20.25" (514.3 mm) for a maximum depth of 2" (50.8 mm). Less wide monitors can be more deep.
For my favoured 22" monitor, Viewsonic VX2262wm, I thought I had checked this. I had not. The viewsonic site is silent on the "without base" dimensions.
Svr, a forum user with this monitor model, might help us here in
Upgrade vx2262wm.