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It depends on more factors.
* Focal length
* Mirror surface height above the ground
So eyepiece height is FL-Diameter/2+height above ground.
Mine (also 16") is 1800mm (f/4.5) and mirror is 20cm above the ground when pointer vertically, so it is 1800 - (400/2) + 200 = 1800mm = 1.80m.
And my eyes are 1860mm above ground (I am 1.96m) so I can almost observe objects near the zenith while standing, but for objects below 60º I have to bend or use an observing chair.
Shorter people have to use steps when observing near the zenith.
When that is a problem, get an f/4 16" Dob which has a 20cm shorter FL, but most eyepieces require a coma corrector.
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