About 6 feet high. I don't think it's the height, more the distance they are apart, which is about 12-13 feet. They are still at 6 feet high front facing and work perfectly. (7 feet apart).
Bar hanging them from the ceiling to get them closer together, which I definitely don't want to do as it looks ugly, the only option is to get a third sensor.
Saying that, there aren't that many room scale games really, or at least ones that I want to play.