Hutches - Size 4x the bunnies size or larger
I recommend a large dog crate with an x-pen attached. This way you can close them in when you are not home but they are not in a cage all day. They still have room for playing.
You can also add shelves Into the dog crates by adding wood and zip tying to the Interior for them to have a second level.
They also make great prefab bunny condos online, I always recommend checking which type of woods they are made out of to ensure not toxic to the rabbits.