I just talked with the SRO at my great granddaughter’s school last week - I think they have one officer shared between the 4 district schools (head-start, elementary, jr. high, and high school). We’re pretty rural - my gr.granddaughter’s class is 12 students, the class ahead of her is 8 students. While he’s just one guy, the schools are all within about a half mile of each other, so likely response time isn’t an issue.
I actually called to discuss their firearms policy, safety plan, mass shooter response, etc. They seem to have a plan and strategy well in place, and they use materials available from state or federal resources to develop their plans.
I’d like to meet the officer face-to-face some time to discuss more details, but I didn’t want to dig too far on the phone lest he think my questions were intended for nefarious purposes.