Accent rugs aren’t just cozy underfoot. They can also anchor an entire room—but correct placement and proportions are key. “When placing a rug under your sectional sofa, it should be large enough to unify and anchor all supporting accent pieces (accent chair, coffee table, side table, etc.),” Harris says. The rug should be positioned at least 12 inches behind the front legs of the sectional. If you plan on placing your furniture in the center of a larger rug, be sure it creates an even border on all four sides—about 8 to 12 inches, according to the pros.