One above-fold unit vs two

One above-fold unit vs two
Tried this today → pushed from 1 to 2 units above the fold on a long-form template.
1 unit: safe, clean, leaves RPM on the table.
2 units (one leaderboard up top, one rectangle right after the intro): RPM +18%, CTR held, no policy heat because content was still clearly the focus.
3 above fold = the danger zone. That's when 'ads more prominent than content' flags start, and bounce jumps.
Two is the sweet spot. Three is greedy. One is timid.
— Steal it.