Mount monitors one above the other?

[danetech]

Want to mount acer monitor above other monitor, cannot be clamped and cannot be on the same mount as the other monitor?

 

[SinxarKnights]

Does your monitors have vesa mounting holes? If so: https://www.amazon.com/VIVO-Monitor-Standing-Vertical-STAND-V002H/dp/B00MTWCO1U/

 

[danetech]

Does your monitors have vesa mounting holes? If so: https://www.amazon.com/VIVO-Monitor-Standing-Vertical-STAND-V002H/dp/B0

Any cheaper alternatives you can see?