Before you decide on the Reptifogger, check the prices of ultrasonic room humidifiers in your area (at home improvment stores or larger pharmacies). They tend to be sturdier with larger fans and nebulizers, produce more fog (which may be better if you want to spread the humidity over 2 cages), don't need refilling as often because they have larger reservoirs, and you can adapt the fog spout with pvc pipe or flexible pool tubing to aim the fog just where you want it.
You could also do some trials with misting and hand spraying to see if you even need a fogger. What's the humidity level in your room generally?