Generally speaking these types of cages don't need any thing to keep humidity in them but if you do I would suggest a misting system over a reptifogger. You could use the same system for both cages
So you would have a herpstat 4 set up as follows:
channel 1: RHP #1
channel 2: RHP #2
channel 3: Misting System
channel 4: lights
Here is a website that sells misting systems:
http://www.mistking.com
A misting system will cost more than reptifoggers but they will last longer and be more versatile.