Uhhhhh, not so fast. Sprinklers do not need to be fully installed in the ceiling to be effective. Effective installation can be done with minimal ceiling intrusion, using the walls for most of the piping.  

Guessing you never noticed in many hotel rooms the sprinklers are mounted by the front door on the wall of the unit to shoot into it. Water supply line goes down the main hallway, branches off into each room. 

Depending on the design of each unit, installation may be far simpler and less obtrusive than you think.

https://homefiresprinkler.org/wp-content/uploads/2016/05/I-residential_sprinkler.jpg

http://homesfeed.com/wp-content/uploads/2015/07/Wall-mount-fire-sprinkler-in-white.jpg

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