What vacuum height works best for low furniture like couches and coffee tables?

A 3.5-inch tall vacuum fits under most couches and coffee tables, which is standard for robot vacuums (most are 3.4–3.8 inches). But the real variable is your furniture’s ground clearance — measure that first. If your couch has 4 inches of clearance, a 3.5-inch robot works; if it’s 3 inches, you need a slim model like the Eufy RoboVac 11S Max.