Sounds like you are on your way to chicken ownership and the dreaded chicken math! I wanted four and now, including hatchlings, am over 💯. Enjoy your adventure.
I have 20” underneath my coops. Even the Bielefelder Roos have plenty of headroom. One of the sides is hinged in the event I need to do rescue work. (The store bought gray coop next to coop two is for broody hens). Connected to the coop is a covered walk-in run with an attached brooder.