So this means, correct me if I'm wrong, that a monk with Inexorable Progress of Dawn who connects with their first 2 flurry hits can automatically cause their foe to fall prone if the space behind them is occupied or a wall. That ... that's good.
Follow-up question: if a monk is hasted, does that "first 2 flurry hits" become "first 2 out of 3 flurry hits"?