Roborock S8 Pro Ultra

It empties into a 2.5 L bag, refills the robot's water, and cleans its own base, so most homes go weeks between hands-on upkeep.

The robot is 3.8 inches tall, so it slides under most sofas and cabinets, though very low furniture may be tight.

It clears obstacles up to 20 mm, so it handles standard door sills but may stop at taller thresholds.

Yes. It supports no-go zones and stores maps for up to 4 levels, so you can fence off rooms across floors.