Many will still work for a roof installation
Missouri Wind and Solar is a good source of information there
You can use the same mounting equipment as you would use to mount an old fashioned antenna.
You need to be careful in your blade choice as you want low noise and of course low vibration.
Again I would recomend missouri wind and solar, the hub I just bought from them was absolutely perfectly balanced! The blades are sharp, flexable, and well built for noise reduction and speed.