There are fourteen Hanafi locations. Reciting or hearing a relevant verse makes prostration wajib, even without deliberate intent to hear.
The imam's recitation is followed within prayer; hearing an outsider is acted on afterward. Repeating the same verse in one gathering requires one prostration. Independently performed sajdah consists of takbir, one prostration and takbir when rising, without hand-raising, tashahhud or salam.