Hi there!
E-Series configuration for CCTV systems will depend on how many cameras, camera resolution, and size of E-Series environment. The best person to advise on specific configuration is the system engineer assigned to your account.
I have reached out to Umar Aziz Jassim from our team in your region to get in touch with you for more details. Please let me know if you don't hear from him soon!
Best Regards,
Alex.