How high should my laptop screen be for proper ergonomics?
The top of your screen should be at or slightly below eye level when you are sitting upright with your feet flat on the floor. For most people, this means elevating the laptop 4 8 inches above the desk surface. This position keeps your neck in a neutral position and reduces the forward head tilt that causes neck and shoulder pain. If you use a laptop stand, you will need an external keyboard and mouse typing on an elevated laptop forces your shoulders up, which creates a different set of problems.
Full guide: Best Laptop Stands