web gateway license vm 4000 users

Hi,

I have got Web Gateway VM license for 4000 users, was checking the sizing restrictions on forums which says maximum users upto 700 for VM machine.

Is it something like if I have to deploy it for 4000 users then I have to install web gateway on 6 VM machines and load balance them.... or single VM machine with increased RAM of 64GB and 2TB disk with a good processor can suffice my requirements...

Minimum recommendations from Symantec Guide is 8GB RAM and 120GB harddisk for upto 700 users....

Need expert view and advice on hw to take it further

Thank you