Requesting to have an option to disable NAT as an ASUS routers do have this option.

We need to disable NAT since it the router will use a public IP address and will have to connect to ISP via PPPoE and will be given an internal IP address.

Here's sample screenshot that ASUS offers for WAN configuration:

We bought the ER605 as we needed a reliable router yet we cannot use it up to now since it doesn't have the feature that we critically needed.