I have polarized, Ray Ban wrap around framed, prescription sun glasses and have never had any glare.
As long as the prescription is not to extreme most places can make them and much cheaper frames than buying from the optical shop, mine are 4 years old and still in good shape.
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I agree, anything on the dash will not look as good but I have used the dash covers for reducing audio reflections which reduces a bit or noise and improves the audio quality.
Just from looking at the picture it appears the one being shown which they did not even show it on the dash, might not fit that great, have lumps, bumps, etc...I have done some work in custom auto upholstery so have a good idea of what things can turn out like, the more complex the dash the harder to make them fit.
The best luck I have had is with Dashmat, the one I had custom made, logo, etc for my old Tacoma ex audio comp truck is still looking like new 15 or more years later.
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Using a treatment product requires finding a none glare and something compatible with the dash material as some actually cause more harm than good.