I think with the article and blog it's always per side, not 1 per game, but 2 per game. Earlier in the week, it was 2 per side for a total of 4 per game. Does that make sense?
Anyway, you don't see teams performing one SOK per game anyway, the Packers attempted one all year and were successful.
Just saying, glad it's even in the game. Plus, based on the blog, it's adjustable with tuner sets.