Podman doesn't actually support `network-online.target` in quadlets because systemd user sessions cannot see system units. https://blog.podman.io/2024/10/podman-5-3-changes-for-improved-networking-experience-with-pasta/
It makes more sense to wrap every quadlet in its own dir. This makes it easier to copy a quadlet with batteries included for apps that require a valid config to be useful.