As for harvesting statistics via the same interface as the link from the MT992 to the router, it really depends upon how the former has been "locked down" and how it can be unlocked. The concept of harvesting via the same interface and via a single cable has been documented by Chrysalis. It just depends upon the MT992.
There is one simple test that you could perform, please. With the MT992 powered off and without any connections to its WAN and LAN ports, press and hold the reset button. With the other hand, power on the MT992 and wait for, say, 30 seconds and then release the reset button. Give the device some "thinking time", say one minute, and then connect its LAN port to a computer whose Ethernet interface has been configured to use a static address of, say, 192.168.1.100. Now perform an nmap scan on 192.168.1.0/24. If nothing of interest is discovered, reconfigure the computer's interface to,say, 192.168.0.100 and perform an nmap scan on 192.168.0.0/24. If that also yields a negative result, try 10.0.0.100 for the computer's interface and 10.0.0.0/24 for the nmap scan.
If one of those tests returns a positive result, please then perform --
nmap -n -sV -sU -sS address_discovered
-- and share the result.