What kind of configuration is used to hang the speakers, a keyhole or machined screw hanger?

I'm not familiar with that particular speaker, but you need to take into consideration both the weight of the speaker and the integrity of the mounting surface.

Personally, I'd go with a stronger rather than less costly mount. I like the self-expanding "butterfly" type hangers. Various faces can be configured to them, and once they are up, they are nearly permanent. And quite strong.