This is the set up we have. We built the litter box enclosure. It has two doorways on the front and one on the side. The top opens for cleaning and also doubles as a window perch. On the inside are two jumbo boxes. We use Arm&Hammer Fragrance Free litter. It's very low dust. We've used this exact set up and same brand litter for 10 years. Never any issues. The cats are happy with it I guess.