Welcome to the
Kitz forum.
From your query with regards to SNRM tweaking I am assuming you that have a G.992.{1|3|5} based Internet service. For an all-in-one solution, I will suggest that you consider those modem/routers with a Broadcom chipset.
Unfortunately the TP-Link devices, although Broadcom based, have been restricted in terms of what can be achieved from the command line. So the VR2600 will not suit your requirements.
Please take a look at the very first post of
this thread. (Ignore the title of the thread, all of those G.993.2 devices will be backwards compatible with a G.992.{1|3|5) service.) Of the devices listed, I will recommend that you research the
ZyXEL VMGxxxx devices.
My current device of choice is a ZyXEL VMG1312-B10D, which works well on my G.992.3 service.
Finally, I've split your post off from the original thread and have used it to create a new thread.