None of mine are 100% perfect, but they are pretty close.
Korr and Amelia will poop out of the litter box a bit, but not a whole lot, maybe a few poops in a week. They are great for pee too with the odd time not being in the box.
Lillian usually really good about both pee and poops. There might be a few poop in her pen or pee in her cage, but mostly it's in the litter box.
Kraken is very good in his cage. Hardly any poops not in the box and pee is almost always in the box. When he is out of the cage it is another story, but he does tend to have a few favourite spots to go in the pen (just not in the litter box in the pen).
Tesla kind of depends on his mood. He is pretty good about pee unless his box is getting a bit dirty, but poops are about 75% or so. His litter box is a tad small, but be won't use anything else. Again, not so good outside his cage.
Gizmo and Nala are maybe 50% using the litter box. They were supposed to be litter trained when I got them, but I guess not so much.