I have two litter boxes for three cats.

Rascal will dig to China and then finally do his business and covers it well. Usually in the middle of the box.

Annie is fairly delicate too - however, Emma is a side of the box pee - er. I agree, it is really hard to get the stuff out of the corners because it doesn't clump as well there. And she doesn't want to get her delicate paws messed up so she just pees and jumps out of the box.

I clean the boxes several times a day - or at least twice.

Rascal is the only one that will tell me immediately to clean the box. He stands there patiently while I clean it and then jumps in the box as soon as I am done.

Wouldn't it be nice to train them all to use the toilet?