VEVOR Floor Heating Mat,100Sq.ft. 14℉-113℉ Electric Radiant Floor Heated Warm System with Digital Floor Sensing Thermostat, 110-120V Includes Installation Monitor, Adhesive Back for Easy Installation
Generally, one is used. If you want to connect more than one, the total power of two or more must be calculated to be less than 1760W. They must be connected in parallel, not in series.