Not sure if I fully understand your question... typically the requirement is to support a certain throughput, interface ports which gets you quickly to the product that would be most relevant to that deployment e.g., if requirement is to support at least 1.5Gbps of firewall throughput, then any PA-4000 series devices would do (and they are all 2U). Our other firewalls PA-500 and PA-2000 series are all 1U.
Let me know if I misinterpreted your question...
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