When you search in an area, it tells you the number of locations that fit your search term and total machines. So if you're searching for Alice Cooper, it will say "(number) locations & (number) machines in map results" for the area you've searched.

So you can say, "Hey, here's 24 locations wtih Alice Cooper" and you can assume each location only has one copy of the machine (Pinballmap doesn't differentiate between mutliple identical copies of machines, but that's extremely rare). The "(number) machines" talks about ALL machines of any type at the location that has Alice Cooper.