fogger ultrasonic in-tank

Hi guys, About to get my hands dirty and start building the frog vivarium. :D The question I have relates to ultrasonic fogger placement inside a waterfall. My idea is to make an inside pool of sorts where the water falls. Sort of a cup to hold the fogger within ... this will be located near...

I'm planning on a fog effect "volcano" for my 45g build paludarium. I need something that cascades and remains low, I can build the containment so the froggies can't get in there, (i have Firebelly Toads), but I'm curious if anyone has any experience with this sort of fogger or may have a...