Confirmation rules are simple:

- buy signal (close bar) on H1 timeframe is confirmed if no any red indicators' color on M15 chart for selected M15 bars (close bars).

- sell signal (close bar) on H1 timeframe is confirmed if no any blue indicators' color on M15 chart for selected M15 bars (close bars).

it is 3 closed bars on m15. Or 4, or 2.
I am using 3 and 2 sometimes. Up to the market condition.
And up to the risk: less confirmed bars are more risky trading but we may have many trades as well.
3 is better.