Mabel the hanging kit for the ATI fixture I have used 2 screws that need to go into something solid (not drywall) like a stud. I mounted a board on the studs and then put the screws for the fixture in that but you could also just go straight into the studs as long as your light will end up being centered the way you want.
The pole solution looks like it would work well if you don't want to make holes.