well I have about ten cages in my garden, all different sizes, and we only have 2 bunnies + 1 that I'm minding for a friend.
we have the main ones up the back on dirt with hay in them and wire dug into the ground so that they can't dig out
one is actually a bird avery so it's really tall, we have boxes in there for climbing, another was built by my dad, it's a big square cage with a dog kennel in it as a nest and then some other boxes for climbing, and then we have one that is too small for normal rabbits, it's one of those raised ones with a nest end and then a bit with wire on one side. we're currently keeping our oldest rabbit in there because he's ten and broke his hip at the start of the year, so he can't move around too much. I think once it gets warmer we'll move him into a bigger cage, this one just has the best nest option for him for winter.
Then we have a bunch of cages on the grass area of our garden, which we put them in when it's a nice enough day and for them to get grass.
we let one of them run around the garden, supervised of course, but because my bunny ran away earlier this year while she was running around, I'm a bit wary of that.
then we also have them toilet trained so that they can round around inside whenever we're home, but at the moment I have all this folio work on the floor so they haven't been able to come inside