24" monitor arm

Based on that, I'd say it likely wouldn't work with a 27". The pics I found make it look awfully small.
Easy way - get the dimensions of a 27", plot the centre point, double it and then measure that against the centre of the VESA mounts on your mount, with the arms at their widest point.

Personally, I'd be looking at something specifically designed to handle that size and weight of twin monitors, especially as you'll have the arms pretty far splayed...
 
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