Noise and maintenance is main problem. When you live on top of other people, you like do so without the screaming sound from a fan belt, or a bad pumpe vibrating the building, from your careless neighbor.

If the Strata is the designated from day one with heatpump, then they in my design plassed in technical room/areas where they are sound dampen and can easily be accessed by maintenance workers. With maybe water exchanger for hot water or a pool.