You can read more info about the Proximity Rules at https://community.wayfarer.scopely.com/t/why-an-accepted-wayspot-may-not-be-used-in-pokemon-go-s2-cells-and-pokemon-go
Here is a L17 cell in question…
And here is the full L14 cell…
Standard Warning: Never use knowledge of the cells to mis-place wayspots to get them in to the game. This is seen as Abuse and can lead to Warnings / Suspension of both Wayfarer and GAMES accounts.