Roborock Saros Z70

It empties into a 2.7 L bag, refills the robot's water, and cleans its own base, so most homes go weeks between hands-on upkeep.

At just 3.1 inches tall, it slides under most sofas, beds, and cabinets with ease.

It clears obstacles up to 40 mm, so it handles most door sills and transition strips between rooms.

It covers about 2,314 sq ft on a 180-minute charge, and recharges and resumes to finish larger homes.