First off, I grew up in a small town, and know that there might not be much there, but I had added many Wayspots to my small hometown whenever I’ve visited, and I have some POIs in mind to nominate the next time I’m there.
McD’s has a sponsorship with PoGo to have stops/gyms at their locations in some countries, including the US. Sponsored stops/gyms are paid for by the company, and do not have to adhere to the Wayfarer criteria, but we as Wayfinders do.
Police and fire stations are not eligible locations, as a Wayspot there may obstruct emergency services. Fire hydrants also fall under this rejection reason.
Shopping center signs may be eligible, as long as they can be safely accessed by pedestirans, and meet the criteria below:
If the shopping center itself already has a Wayspot though, the sign may not be eligible, as the center itself would be the eligible POI.
I also agree that neighborhood signs do not meet any of the 3 criteria of being great places to socialize/exercise/explore, however there are some that do. We also haven’t gotten any clarification on whether or not they are eligible, however most may only accept them if they have something that may make them eligible, like a water fountain or unique art.
Cyndie did provide you with links to the criteria, as well as recommendations for low-density areas (yes, it says tips for rural nominations, but it’s also helpful in low-density areas). I would highly recommend reviewing this info, as well as the Criteria Clarification Collection, as it covers some of the most discussed POIs. Reviewing may also help you get an idea of what may or may not be eligible.