Any treadmill will work with this setup since all of the information about pacing is being transmitted via footpod or a running power meter. In fact, you don't even need a treadmill. Just walking around the house within signal range will work.
I use Proform Boston Marathon 4.0 treadmill, which is pretty advanced with a 15 mph (4 min / mile pace) max speed, incline of 20% and decline of 6% and tons of other features. As smart as this treadmill is, I don't use most of its features.
When running on Zwift I set the incline to 2% to compensate for the outdoor wind resistance (most research suggests 1 to 1.5% incline). Occasionally I would manually speed up or slow down the pace by pressing the buttons on the treadmill. Zwift can't communicate with the treadmill so setting higher incline is pointless since any elevation gain will not register.