We were in a similar situation with hard wired smoke alarms. We decided the end result was easier & cheaper if we just bought the units in bulk & had them installed by the same contractor who was already doing fire order related work in the building.
The OC paid for the purchase & installation of the smoke alarms. Doing it this way ensured that all units complied, reducing the risk to all other lot owners in the strata. Also kept our fire protection & insurance people happy.
Much bigger strata though, 300+ lots.
All the best with your cost recovery.