Create a service rectangle
Mark the machine footprint on the floor with tape. Then add the space needed to pull the waste drawer, remove components and stand in front of the machine while cleaning it. A product that technically fits into a corner can become frustrating if you must drag it out every time you service it.
Approach path matters for the cat
Avoid forcing the cat to squeeze between furniture before stepping into the machine. A straight, visible approach can matter more than saving a few inches of floor area.
If the robot sits near a wall, check whether the cat can exit naturally without immediately turning into another obstacle. This is especially relevant for large cats using enclosed models.
Noise and odor are more noticeable in small homes
A cycle that is unobtrusive in a basement may be obvious in a studio apartment. Look for adjustable cycle timing and consider whether the machine will run near sleeping or working areas.
Odor storage matters too because there is less air volume and fewer places to isolate the box. A sealed drawer and a realistic emptying routine can be more valuable than maximum theoretical capacity.
Best small-space rule
Choose the smallest machine that the cat can use comfortably and that you can service without moving furniture. Space efficiency that reduces cat acceptance or makes maintenance annoying is false efficiency.