[SharonSnowbird]

Hello and welcome to YT!
If you use disposable pee pads, you just throw them away and put out a clean one every day. Easier to do than cleaning out a litter box. And you would definitely have to use them because you would not be able to let your puppy out to relieve himself as you will be working all day.
A friend of mine had two cats and got a Yorkie puppy and the two cats chased the puppy all the time, it was a real problem. In my personal opinion, if you say your cats have to be your main priority over a new puppy, I think it would be best not to get the puppy right now. A nine week old puppy will need a lot of attention and training, unlike cats.