Difference Between 1 and 2 VM-Series Firewalls Without Subscription Licenses

[A.Batrisyia]

Hi Team,

I am looking to understand the practical differences between deploying 1 unit and 2 units of Palo Alto VM-Series firewalls, particularly without any subscription licenses. I am aware that subscription licenses enable services like Threat Prevention, URL Filtering, and WildFire, but in a scenario where no subscriptions are used, what would be the key distinctions between running 1 firewall vs. 2 firewalls?

Thanks in advance for your insights!