Favorite Big, Easy to Clean Litter Boxes for Multiple Cats?

Hey! I have 3 cats, with two of them being on the bigger side. I am looking to replace their litter boxes with ones that are large and easy for me to clean/dump. I also have a chihuahua who's a certified shit eater so preferably something taller because unfortunately, my cat's do not understand how to use a flap door or a top exit 🥲

I know that you're supposed to have one box per cat, but my apartment is pretty small and I don't want it to smell like I have three cats if you know what I mean lol. I would be interested in automatic cleaning litter boxes, but the last time I looked into those they were like $500, which is way out of my price range for a shit box.

Any and all tips appreciated.🖤