Pet adoption ideas, can someone help?

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I have 2 cats and a hamster. I feel like I can squeeze in another pet, but I'm not sure what pet I want. I saw these 2 cute ferrets and I fell in love with them. They were so playful and cute. They had a little hammock and they were just enjoying their life. I have heard on the other hand that they are quite smelly. I'm not sure how true that is, since people sometimes make stuff up or they just don't quite clean their pets frequently enough and that's why they have issues. I was thinking of getting another hamster for munster the hamster to play with, but now he's like a bit grown, that I think it's a bit too late to get him used to sharing his own space. I need suggestions??? I won't get a lizzard or a snake, that's just not me! I had fishes, and I'm not a big fan of cleaning those tanks uggh.