When I order computer glasses I do the calculations and use the ADD component so I have progressives. I don't have to tilt my head when looking at the computer and I can easily read things held in my hands without needing to extend my hands.
The reason people have to tilt their head with progressives when looking at a computer screen is because the intermediate distance component of the lens is quite small and near distance component is not much bigger and is at the bottom of the lens. Like this:
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Zenni does have an option where they will build a set of progressive glasses from your regular prescription, no calculations necessary, for a couple of applications. Like this:
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I've never done this, always used the calculation method, but I think next time I will give it a try.