Hello and welcome to the forum @dylank28
There is a mention of this in the Little Free Library Clarification which I will link below:
There is nuance to this discussion since laws vary around the world about where Single Family Private Residential Property (SFPRP) ends (the property line). Niantic/Scopely are sensitive to things being on SFPRP. So unless it is very clear that it is village/city property I’d avoid nominating there. And/or provide supporting information to make it clear.
Actually @DTrain2002 grabbed the one I meant to grab. But both Clarifications are good to read.