3.19-inch ultra-slim robot vacuum and mop with 15,000 Pa suction, TruEdge 2.0 edge cleaning and a 10-in-1 OMNI station.
Verdict: The pick if low furniture is your problem: it is one of the slimmest docked vacuum-mops with strong edge cleaning.
The DEEBOT T50 OMNI is 3.19 in (81 mm) tall so it fits under low furniture. Its Amazon listing lists 15,000 Pa suction, ZeroTangle 2.0, TruEdge 2.0 extending side brush and mop, AIVI 3D 3.0 obstacle avoidance recognising 100+ objects, and an OMNI station that self-empties, refills, washes mops with 167°F water and dries with 113°F air.
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Roborock
Self-emptying Roborock with sonic VibraRise 2.0 mopping, 10,000 Pa suction and 70 days of dock capacity.
The best mopping you'll get under $300, with self-emptying included. You still wash the mop pad yourself.
Dreame
Self-emptying vacuum-mop with 20,000 Pa suction and a dock bag that lasts up to 120 days.
Dreame
25,000 Pa vacuum-mop with a TriCut hair-cutting brush, extending mop pads and ultrasonic carpet detection.
Dreame
10,000 Pa robot vacuum and mop with MopExtend edge mopping and an all-in-one base with 75-day auto-empty and mop washing and drying.