They only seem to recommend 34 inch screens, not sure if that is because they don't rate any 49s or not...
Think that's because it's specifically ultrawide monitors rather than superwide. As far as I can tell the biggest 21:9 monitor you can get is 38".
Edit: LG 38GN950 might be a good compromise between size and resolution.
@Brun started
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They only seem to recommend 34 inch screens, not sure if that is because they don't rate any 49s or not...