As an anecdote: I have one system (x86) with pi-hole and unbound in a docker, and a secondary raspberry pi with pi-hole running on bare metal. The docker system (although much more performant in general) has a lower latency as the raspberry bare metal install.

I have all these services in docker as well (although not with the docker compose file here) and they run perfectly fine with a very low resource footprint.

Sounds like OP is a teacher at a school. Schools very seldom have It departments, even in this day and age…

What is GIL? Golden Irish Lumberjack?

Fun fact: „Fön“ translates to hairdryer in German.

Have you literally not heard of WiFi repeaters? It is a whole device category.