Not sure if you have attic access, but I'm currently installing 4 HTM-200s as tops for atmos. The two inserts are not in the middle, so I didn't trust flush mounting them on the ceiling because 3/4 of the weight would essentially be functioning as a lever. I'm sure they would be just fine, but I'm a big fan of overkill.
I added 2 hanger bolts at the same distance from the edge as the top inserts. I also didn't want to penetrate the back of the speaker so I only drilled 1/2" deep and put the screws in .43" deep. I used 2 threaded rods for the inserts (which for some reason are M6 not 1/4-20 on all 4 speakers).
On another note, my initial impression of adding the tops (TF/TR) in my 5.2.4 is amazing! Sound all around and I don't miss the rears one bit. It's like going from 2.1 to 5.1. The dolby upmixer is also phenomenal.
They also blend perfectly with the RAAL towers and horizon. IMHO, they are excellent atoms speakers.
http://imgur.com/a/uw095