1 tire line. 285/70R20 tires sized to your wheels and your car.

A 285/70R20 is 285 mm wide with a 200 mm sidewall (70 series) on a 20 inch wheel, 35.7 inches tall overall. A tire size only makes sense next to a wheel width and a car. 285/70R20 mounts on a range of widths, and the overall height decides whether the speedometer and the fender stay happy.
1 line carries 285/70R20, from Toyo. By type that is 1 all terrain. The tire has to stay near your car's stock height and mount on your wheel width, so pick the car and the wheel set and the page keeps only the 285/70R20 lines that do both.