Unfortunately, many suburban areas like this don’t seem to have much, as most of the area contains single family private residentual property, or PRP for short. Anything on PRP is ineligible, even if you can access the Wayspot from the sidewalk.
Niantic actually wants us to think that we can safely access any Wayspot at its exact location, not from a distance, and with your fountain example, the neighbor could see this as trespassing on their property if you do have to be right at the Wayspot. This could be an issue when it comes to scanning, for example, as you do have to typically go around the Wayspot to get a proper scan.
Even though the below thread is for rural nominations, it may be helpful for suburban areas; I certainly have looked for many of the things listed in the more suburband areas of where I live. You may also want to check out the Criteria Clarification Collection for additional examples.