SMG design Questions

I need a solution

(the design attached)
i would like to implement TWO SMG physical appliances as below :

1- one SMG is Scanner only and the second one is Control center & scanner

2- will use inbound & outbound email for both SMG

3- Two physical interfaces on each SMG eth0 & eth1

3- will add a smart route on microsfot Edge Server to forward outbound email traffic to SMG hostname and will use DNS round robin to have a loadbalance for the two SMG.

4- for inbound traffic will create two MX record with same preference.

My Questions :

A- my above points follow the best practices ?

B- is it ok to have eth0 & eth1 in same subnet ? ex. eth0 (inbound) & eth1(outbound) 

C-  any recommendation ?



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