Yes. My setup is Modem -> Netduma -> All devices. I do not need PPPoE connection. My modem doesn't support that regardless.
How can I tell if my Modem is an ONT ?
Yes, if I connect Netduma port 1 to port 1 of modem, and connect the Netduma wired to a PC i can access the interface to the internet.
Yes, the wifi is disabled on my Modem.