I use a Mistking, and my chams enclosures are in my room. I have dark grey walls and to prevent any extra mist getting on the walls, I taped cut-to-size black trash bags to the outside of the cages that is against the wall. (As well as between them so my chams don't have to see each other all day and freak out.)
I've found that you don't really have to worry about your floors AS LONG AS you have lots of plants/vines/sticks inside n e a r the nozzels. I have plenty of things in each cage so the mist doesn't travel all the way out of the cage. It all beads up nicely on the vines and such, and none comes out onto the floors.
I personally love having a mistking because its very, very easy. I fill up a bucket about twice a week, and drain a bucket about once or so a month. Besides that, the mister itself is on a timer, so I never even have to turn it on or off for my guys.
I also have a drip system, but the mistking is so perfect for me, that I never use it.
Everyone has their preferences, but I hope you find what works best for you.
Best of luck!