get the monitor height right before you cut wood!
i'm 6' tall, Donna is 5' tall.
I made a riser to lift the monitor up to a height that was comfortable for both our necks/viewing, and the relationship of my progressive lenses so I don't need to lift/lower my chin to see everything, including small sub-title/credits text clearly.
kept messing with piles of books until we got it right.
that determines the bottom of your monitor, then go from there.