I have struggled with this same question as we roll out our 100 cameras. We have 1 site with 3 buildings and 2 divisions.
Buildings: School, Church, Parish Hall
Divisions: School, Church
I considered 2 networks, one for school and one for church, but decided against it and went with all 100 in one network.
I have applied tags to distinguish between areas within the school, classrooms vs. offices, etc.
And I'm using a standard naming convention to help with "sort by name." I start with Church or School, and then follow a somewhat consistent rule of room number, teacher name, and maybe a major tag.
I'm not 100% sold on this, but it is working as of now.
Related to this, I submitted a wish list to Meraki to allow grouping of cameras (banding, grouping) by some tag or some other method. These groupings could be collapsible and offer some summary data when rolled up. Verkada has something on this and I wish Meraki did as well.
Esteban J Nunez
School and Church
K-12 Education