FortiGate 90D and dual rings

Hi

I have been asked to design a critical infrastructure network that is going to be using FortiGate90D firewalls

The system will have a large fibre ring passing through 20+ sites

this will be a large layer 2 network with VLAN's and CoS/QoS

the actual volume of data is not that great, but it is critical.

At the main data center end, it is my proposal to connect the end of the fibre rings to 2 x FortiGate 90D's and then connect these to Firewalls together, to complete the ring.

on the data centre side of the firewall i am proposing another ring made of 2 large switches and each server will connect to both switches so that i have some resilience

Will the FortiGate support all of the above ?

Thanks