Please add a local DNS server, like dnsmasq, to the ER605. It's a bug for a business router that's running DHCP to not be able to resolve local host names.

I intend to deploy this exact configuration: https://www.tp-link.com/us/support/faq/2949/ The only difference would be the EAP-225 outdoor, which would be wired, as the house siding is aluminum and I