Which Size Infrared Sauna Should I Get To Put My Feet Up & Lay Back In? (fit 2 people??)

Which Sun Stream Sauna model should I get, that is wide enough to put my feet up and lie back during my sauna sessions? I might want to use it with two people occasionally, but most of the time it'll be used as a one person sauna. https://youtu.be/g-yxcdPAkXY