First of all, I am completely new to the world of edge routers.  I have dealt with the basic wireless routers for the last several years though so I have some knowledge, just not the amount I need to properly configure the ER605.  I believe I need to have two vlans, for for home and one for IoT devices.  I also run several self hosted applications that I need access to from the internet via port 443.  Below is shot synopsis of my setup.

I currently have a total of 3 routers in my network, the 605, an ASUS wireless router and an Aplifi wireless router.  The modem connects to the Wan port on the 605, the Asus and Aplifi are attached to the 605 via ports 2 & 4.  The Asus handles my home network and the Aplifi is for the IoT devices in my network.  The Asus and Aplifi servers as each network gateway and DHCP server.  This setup seems to work for the network separation, just not sure if vlans for each of the wireless routers would be better or not as they are connected directly to the 605 now right out of the box and it seems to keep them separated. 

Thanks,

Michael