NVR is the term more used to describe the function ( No volt release) but has become the name associated with the little versions put on lower powered tools and typically limited to 2kW as you say.
The toolstation type (usually used with an overload relay as per my diagram for another tenner) is known a DOL starter (direct on line - a method of starting medium power motors up to say 5hp (4kW))
This offers the NVR function as well as motor overload protection and in my book is important for induction motors.
The DOL starter also has the ability to have a remote emergency off switch wired in to be foot or knee operated in the event of a problem
It is questionable whether an overload relay will be fast enough acting to protect a brush motor which tend to have such lean designs that the smoke can be let out both easily and quite quickly.
So for the router table you have a choice. In a 1 man shop where you are in total control, maybe using the switch on the socket is OK especially if you have soft start on the router (otherwise the inrush current on start up will kill the socket switch in time).
However it is more normal practise to have an NVR in some form and the TS one (of either power rating but with the correct 240v coil) is an excellent low cost example. I've fitted 10s of them on mine and other peoples kit and only had one dodgy one in possibly 10 years?
Whichever set up you decide on, always unplug the router from the wall when changing a cutter a good habit to get into (do as I say not as I do!
) is to put the plug in your pocket and get used to feeling that discomfort when cutter changing.
hth
Bob