Opie said;
"Hmmm, do you think I could wire one transformer to run 2 or more units?"

Probably, they use standard wallwarts.
And they may be shippng the same one that they ship with the fountain foggers which also support an LED display.
But if it's running that hot...
Just look on the mandatory label for the max current rating and divide by two.
Then check the modules appetite.

Doubt that a small voltage drop would cause 'em to drop out of oscillation.
Don't know enough about how they work, yet, to guess if it would affect droplet size.
If so, it's a "feature". Makes 'em tunable.
Love the float.:thumbsup: Gonna steal it.

Regards
Weeze