I suppose it all depends on whether or not a flood is involved or just a dropped coffee cup. My workshop floor matting is made up of interlocking dense foam mats about 1/2 inch thick and small spills of liquid get absorbed to evaporate later.
The biggest handling hazard is the trodden in swarf which becomes embedded and can't be removed. I don't think the Screwfix mats are intended to be used in other than full contact with the floor and could squirm about on duck boards to become a trip hazard as a result.
In any case, why put something on top of a duck board? Being slatted everything drops through to the floor below.
Regards Brian