@Alex789 I can try this but the settings on the WRT3200ACM are limited as you can see in the picture below so I don't think I can create two subnets. Any thoughts? Thanks.

The reason I need the ER605 is like you stated, as a firewall and for ACL rules. I was able to get this partially working by setting up a VLAN on the switch for the WRT3200ACM router in the following...

I just installed an Omada setup in my house with the following hardware and connected in the following order. WAN -> ER605 -> Switch -> EAPs -> Hardwired Connections I have a Linksys WRT3200ACM...