I have 4 4x8 dome pens but I don’t use them to raise chicks. I use my 4 4x8 wooden pens.
I have all my pens behind electric fencing but the wooden pens have welded wire and hardware cloth around the bottom foot so the chicks can’t squeeze out. Don’t use chicken wire for this because day old chicks can get stuck squeezing out. If you just use 2x4 welded wire the chicks will be running all over the place. I do it sometimes but.....some hens will kill the chicks if they get in their pen especially if they are setting on their own eggs or raising chicks themselves.