SQL Option and Commerce Portal

Hi, I am recommended to have 3 physical servers and 2 SQL Server in order to implement a solution on Attain SQL Option 3.10A and Commerce Portal. Has anyone have successfully implement Commerce Portal on 3 physical servers and 1 SQL Server ? Thanks in advance.

We have imlpemented the thing on a Backed SQL Server(Data Center of 2 Physical Servers) + 2 NAS Servers(2 Physical Servers) + Clustered Commerce Server/IIS(2 Physical Servers) = 6