Place the monitor on your desk, not on the central processing unit. That's one of the biggest mistakes people make, Congleton says. Your eyes should scan downward, which helps avoid neck strain and headaches. Make sure it is straight in front of you, not off to the side. This also will help you avoid twisting and turning while referring to other material.
Some keyboard trays have room for the device, while others can be attached.
You want to avoid reaching or straining your neck and shoulders. But if you can't prevent harsh overhead lighting, glare filters can help. Your work surface dictates how everything else will be set up. If you insist on using an old desk, consider modifying it to fit you better. To get the proper leg clearance, for instance, you might have to take out the center drawer.