I had 2 broody hens last spring so I collected fertile eggs from the groups I wanted...EE, RIR, Buff Orpington & Wyandotte. I set up 1 hen with her own 6x8 section, just her & 7 eggs in a nest box, food & water. Multicolor eggs didn't bother her, she sat diligently. Nest box was extra big and sitting on floor, full of wood chips. At that time, it was cold here, March, so temperatures were kept about 45 to 55 degrees in that building. Mama kept her eggs warm.
A month later, the other hen I tried in a large coop section with a few other hens. When a few eggs got broken after 9 days of peace, I decided to move her & remaining 3 eggs to their own section next door to the other mama hen, 6x6 room.
From that point on all went well & 10 eggs hatched just fine & both mamas were wonderful. So from what I've learned, it's probably best to have just broody mama & her eggs, she doesn't need anyone else as long as she is in a protected area. I did set up food & water nearby her nestbox & every morning enticed her with a few mealworms & Sunflower peanut raisin mix, she'd get off eggs long enough to eat, drink & let a big, stinky poop out which I promptly cleaned up for the compost heap lol.