My main monitor placement in my home office is up and down (two monitors on top of each other) and this dual arm is not suitable for such a configuration. . I installed it with two 27 inch LED monitors side by side with no problem. The armrests are adjustable in height and monitor orientation (landscape or portrait) and can be offset but not stacked. I will be using this for my wife's desk as she only needs two monitors (I use 5, one in the middle and two on the sides). Overall this is a good mount and most users will find it acceptable. P-)
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