Hello and welcome,
In short, it’s a hard no for both of these types of locations.
Pretty much anything on the grounds of a police station will be seen as possibly obstructing emergency services. I have had many Wayspots removed from police and fire stations, so there’s a pretty hard line to prove something at a police/fire/ambulance station doesn’t obstruct emergency services, even if they are things that are open to the public.
As for K-12 schhools, even if something if on the boundary of the school, it’s still considered on school grounds and ineligible. We have had others note that schools have wht could be eligible POIs on outer fencing or boandary walls, but they are all on school grounds, so they are ineligible. This is noted in the criteria clarification below:
I would also use the clarification of the outer facades and boundaries of the property when it comes to prolice/fire/ambulance stations. There are memorials at many of our emergency stations, but I would never consider nominating them as someone playing in the area could still cause some sort of obstructing to the services provided.