Hey Jeremy,
if you have a water-cooled non-ATC spindle, see here for drag chain width computation. Usually with 60 mm you are on the safe side, but 50 mm may be enough. Tom @TMToronto which uses an ATC spindle, that additionally needs compressed air for tool change and also for sealing air, plus air for the Minimum quantity workpiece lubrication (MQL), uses a 100 mm wide chain
I think you can fit a drag chain of any width, it’s more that you have to reserve the space needed around the machine (= make the table top big enough).