SEPM Reverse Proxy for Mac Clients

Hello all , I have two SEPM's 12.1.4 running in failover mode supporting about 1600 endpoints . Now I have a requirement to configure a reverse proxy on SEPM to support about 200 Mac clients so that they take take definations from SEPM instead of going to the internet.

I have gone through this document ( http://www.symantec.com/business/support/index?pag...)

apart from following this document is there any other configuration or best practice document I need to follow to achieve this.

Secondly do I need to configure the reverse proxy on both SEPM1 and SEPM2 ?  SEPM1 is primary and SEPM2 is secondary.

Thanks & Regards