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The imported Power Spots did not necessarily have to meet criteria. Please see this post about that: Clarifications on Pokémon Go Power Spots
About the locations in front of homes, sometimes nominations get accepted in error, and sometimes locations that are eligible can look ineligible, especially with little free libraries. Please see these clarifications about those.
A fire station would not meet the criteria stated here: Wayspot Criteria — Wayfarer Help Center
You might want to read this topic which has a lot of suggestions about points of interest you could look for if you do want to try something else: Tips for Rural Nominators
And this topic goes over a lot of the mistakes new submitters tend to make, and how to avoid them: Top Mistakes Made When Nominating, and How to Avoid Them
If the only thing you wanted to add as a game location is the fire station, we are not going to be able to help you. But if you need some help identifying candidates that are more likely to be successful, a lot of folks here are great at looking around on a map to point things out. If you choose to leave a location for suggestions, be sure to protect your privacy.