This is an example of part of an ansible.cfg.
The global location is etc/ansible, and the file name is ansible.cfg.
You've got the default section for your global defaults,
and you can also reference your inventory file.
You're going to have an inventory property in the Ansible config that
tells Ansible where to look for its default inventory.
And then you can specify those inventory groups to apply settings here as well.
So it's really going to be a boiling down to you and your team's conventions.
I would definitely recommend that you put y'all's heads together if
you don't mind the Southern US slang to decide on a governance
strategy for Ansible, one of which is where you're going to
centralize your settings and inventories.