Just figured out how to identify the different running wow applications, this way the different wow processes will not all be named "World of Warcraft"

Right click on your copied wow and select Show Package Contents, open info.plist and change the string for "Executable file" & and "Bundle name" to what you want to show in Process list (Activity monitor) this is also the identifier you will use for process name in Apple Script.


Now you can resize your wow windows with apple script.
example here fits 4 windows on a full hd screen.
Code:
tell application "System Events"
   tell process "World of Warcraft"
      tell window 1
         set position to {960, 518}
         set size to {960, 563}
      end tell
   end tell
   tell process "World of Warcraft 2"
      tell window 1
         set position to {960, 23}
         set size to {960, 563}
      end tell
   end tell
   tell process "World of Warcraft 3"
      tell window 1
         set position to {0, 518}
         set size to {960, 563}
      end tell
   end tell
   tell process "World of Warcraft 4"
      tell window 1
         set position to {0, 23}
         set size to {960, 563}
      end tell
   end tell
end tell