Only my own opinion, but I don't like the shower idea, it's way to stressful, and there are much easier alternatives.
If you already have a MistKing, you need a Raindome!! it's the rain like drops that stimulate them to drink.
I made my own with Mistking nozzle (2) and a Tupperware container about
12'' long, 7'' tall and 8'' deep.
Just cut 2 holes in the bottom, hot glue the nozzles in place aiming straight down, connect the 2 nozzles to you main line with a "Y" adapter, and your done!!
Something like this:
It seems to work better if it's at least 6'' tall. The "rain" is more even, don't know why!!
P.S. you will get better rain drops if you poke some holes in the cage screen. About 1/8'' will do, like spaced out every inch or so.
I use a straight dentist pick, but a pen or really thick needle would work. Your only enlarging the tiny holes that are already in the screen
to allow better water flow to make bigger rain drops
