The unique flex design of the DS-424STA makes this the best quad monitor mounting solution for your large screen LCD monitors. DoubleSight's flex design offers the user complete flexibility when adjusting their monitors on the desktop. Each monitor adjusts independently of the other monitor for height, tilt, swivel and pivot for a truly custom view. In addition to height, users can also move monitors forward or backward on the stand for a better ergonomic fit.The dual and triple flex stand model is easily expanded as your viewing needs change. Utilize the tier extensions to add a second or third row of monitors to your existing stand.