Ultra-sonic fogger propagation

http://www.nutramist.com/nutramistgardens.html

I am interested in making an aeroponic fogger propagation tray.

Seeing as I'm not spending 700$ on the fancy premade shit I'm making it myself with things I already have.

I have.
One heating pad with temp control(covered in white plastic to protect it).
One 72 slot jiffy pellet flat
Rockwool inserts
One Ultrasonic fogger in a cup of water.

I'm probably going to use small amounts h202, no damp and super thrive.

I plan on using this for cloning.

now looking at that thing could I just put the ultrasonic fogger in a glass of water and inside my prop tray? or should I make a system so that the fogger is below the rockwool inserts?

You want more water....that small cup wont last long and may get pretty hot