Okay I get it, you want to use the siren fuction of the spotlight camera as a siren from within Smart Home Monitor thus a SHM alarm would trigger the siren.
I am trying to do the same thing using ADT Tools 2.
So far, I am getting nothing. The siren does not show up.
Like I mentioned above though, the battery / solar models of the cameras are not on the supported list, the wired versions are, although support seems awfully limited. Only about 18.5% of the listed features for the devices actually work in SmartThings…