How high should my monitor be for people who use the computer a lot?

Hello there

im sorry if this question is a bit wierd and for the bad spelling if there is ive asked the same question just wanted to know what is the best to do in this situation

i wanted to know what is the best height that the monitor for a computer should be 

because the optimal settings that are told in the most ergonomics sites that the top of the screen should be at or below eye level for computer users

but the problem with this is that the user needs to look down at the center of the screen which isnt so comterable and causes this hunchback posture if stayed for to much

so the best solution that ive heard for this is to use books to make the monitor go higher so the middle of the screen will be at eye level

now the good thing for this is that is much more comfterable that sitting  bent down like the ergonomics sites says but it causes another problem and you can check it yourself that after some period of time if lets say you use the mouse with your right hand slowly the upper boddy tends to lean to that position meaning to the right

i wanted to know if anybody knows a good solution for this problem because ive been away not using the computer just because of this problem,bending to the computer makes the neck hurt after using it after a couple of uses and makes a hunchback posture  , yet puting books under the moniter to make it be higher and more lookable makes a problem that all the upper body is leaned to the right after a peroid of time

any solution for this?