Um, lots of potential problems here. You won't be able to house them together very long, so plan on building or buying a cage for each cham. Don't free range your feeders. Confine them in some sort of plastic container so the chams get a chance at them before they lose their gutload and dusts (you must gutload the crix with fresh leafy greens, fruit, and cereal grain, and dust them with vit D3-free calcium each day, calcium with vit D3 about once every 2-3 weeks, dusting with herp vitamins about once every 6 weeks). The chams will need exposure to either direct sunlight (not through glass or heavy screen) or a ReptiSun 5.0 UVB tube fluorescent terrarium light every day.

There is a very active cham forum you will want to check out for more detailed info, ideas, husbandry, etc. at www.chameleonforums.com