I only like to be able to manage a broody by herself for several reasons. I don’t trust myself to remember to pick her up and remove all the eggs every afternoon for one thing and not all hens will accept me doing that the same way. Some will peck and start fighting. Then you might get a helper and that could be great if you catch it early because together they can each cover maybe 30 eggs if they full size hens but it could be very bad because once the hatching starts in a coop, the custody battles begin and babies can be killed in the hen fights. Ideally I like to have something that I can place in front of the nesting box the hen chose, like a movable extension cage that I can have some water and a small amount of feed for her and later the chicks. If a hen in one of my smaller stalls gets broody I just chase everything else out. Maybe I can put started pullets in there to finish out because they won’t interfere but no laying hens. If a hen finds a spot outside, hidden I might be able to drop a chicken tractor over her for safety but I have to watch the weather for flash floods.
So I read the other comments as well as yours. Even if your eggs aren’t fertile you still need to mark the eggs. The other hens will lay eggs with a broody. They don’t know their eggs aren’t fertile. You will have wasted eggs with runny yolks if they stay warm too long.
I don’t want it to sound like what all I have said is cast in stone. I have had success as well as failures. Also broodiness is kinda contagious. But there too it will be a problem when you have multiple hatch dates. You can have a hen abandon her nest and fight for hatched chicks. Sometimes if I have a hen two weeks into brooding and suddenly she has a helper plus 5 other hens are showing me they want babies as well, I might open the coop and make all other hens forage and warm up the incubator, close all broody hens in the coop and kidnap the partially set eggs and start everyone fresh with as many eggs as they can each cover. All evicted hens and roosters can follow me to an alternate stall temporary.
I guess that’s a lot.