No, they're very good.
They're both fully litter trained, so apart from the odd stray pellet, the main impact on the carpet is loose bits of hay that fall out of the sack or stick to their feet. I hoover every day for that reason, and clean out their litter trays daily so that their wee doesn't start to smell but honestly, if you put in the effort, rabbits are the cleanest, most odourless pets.