Not that much if you have temperature monitoring and you set them to downclock or even shut down if it goes off the charts, but there will be a few inconveniences:
Reality tight math, one of the AC units to underdeliver or fail and you're overheating the room, quite a small one, 5 extra miners means 5 3k heaters going full power in a one-bedroom apartment with 30 Celsius outside. Not funny!
Second is the airflow, just as Phil said, it's not going to really work perfectly as it does on paper, you're going to have a hot spot that is going to be way hotter than the entire room opposite the AC units near the ceiling where heat will be essentially trapped in this setup, so I would have two ducts on each side going straight to the back with an end fan and press the hot air with a cold flow for extra airflow and circulation.
So unless the building really heats itself during the day to above what you said due to direct sun, no shade, or materials, it should not be a problem. But, to be honest not really a thing I would want to be in charge of it.
Oh yeah, I'm curious about the end result, unless, of course, it's doxing somebody.