How far from the water intakes & drain do the receptacles for a stackable washer/Electric dryer need to be and does code require a GFI?
The 2017 NEC does not specify minimum separation. In a dwelling unit 125v receptacles in laundry areas require GFCI protection. In other than dwelling units laundry areas are not specified, but within 6' of a sink 150v to ground or less single phase receptacles 50A or less and 3 phase receptacles 100A or less also requires GFCI protection. (Each leg of a 240v circuit is less than 150v to ground.)
This claims to meet UPC code in the USA:(and I think answers your question regarding distance)
(Not that I would pay THAT price for it).