ASK - need Advice for Multi Networks in 1 Environment

Hi There,

Need advice here. Hope my English can be understood.

I like to build system network on my workspace (as requirement from top management) that:

1. there are 3 networks, in 1 workspace. NET-A, NET-B, NET-C

my plan, each network use dedicated port on fortigate. (NET-A use port1, NET-B use port2, NET-C use port3)

2. we have 2 internet provider, and at this moment will not use for load balancing. So each internet connection is independent.

3. NET-A use WAN2 for internet connection; NET-B use WAN1 for internet connection.

VPN SSL listening on WAN1.

I like to configure like this:

while device in 1 workspace,

A) NET-A --> WAN2 --> VPN SSL --> NET-B <--each traffic scanned by built-in Antivirus --> NET-C

B) while device in public area / out from workspace,

NET-A --> Internet mobile--> VPN SSL --> NET-B <--each traffic scanned by built-in Antivirus --> NET-C

or

NET-A --> WAN2 --> VPN SSL <--each traffic scanned by built-in Antivirus --> NET-C

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is the scenario possible to be done by fortigate appliance?

if yes, what model I need to buy?

kindly please help. thank you.