No, not house rabbits, they live in hutches in a great big shed ...... and it's a good question
The litter trays are in their hutches you see, rabbits pick a corner to use to urinate in and if you put a litter tray or specially shaped corner loo in their chosen corner they will get used to using it and teach the babies to go there too. It makes life so much easier as the loos can be emptied every day and a dusting of shavings added to soak up the pee. Most of the dry droppings will be in there too.
Some folks keep rabbits on a wire floor so the stuff drops straight through and cuts down the workload. I don't keep my rabbits on wire, it's more work for me and costs more to raise them but is more natural for the rabbits. Cleanliness is crucial to rabbit health so the corner loos prevent urine and ammonia build up in the hutches.
Ideally they would be in a moveable run/rabbit tractor on grass but I can't guarantee disease free stock if I do that. If I ever stopped selling them to breeders that's the best way to go for sure and the healthiest way to raise meat rabbits, as grass fed meat has 4 times the omega 3 that non grass fed meat has. I cut fresh grass for them daily but direct access is better still.