Conventional wisdom is that the wrists should be kept straight . In this case, conventional wisdom is correct, as far as we now know. Conventional wisdom for monitor height is that the top of the screen should be about at eye height. This is fine for some people, wrong for many. The current recommendation is that eye height is the highest a monitor should be, not the best height.
Many people find a low monitor to be more comfortable for the eyes and neck.
Conventional wisdom for wrist rests is that they can do no wrong and should always be used. This is wrong. Conventional practice is to supply wrist rests for the keyboard but not the mouse. Mouse wrist rests are a good idea in many cases, but the same warnings apply. In actuality, some are good and some are probably bad.