In the UK, from my experience at least, providers combine the modem and router into one device. In this case, the Numa wouldn't really cover it and you'd need to buy a switch as well.
Not uncommon in the states, but there are workarounds.
We are working on a passthrough USB HFC/coax media converter. Still won't solve the problem 100% of the time, but doing DOCSIS decode and scanning at Layer 2 is possible in a lot of cases.
Comcast and Verizon like to combine them as well in the US. Of course, we have more cable companies and phone companies than those two, but I'm less aware of what they deliver.
If you have a Comcast modem then you're paying too much - they charge $10/mo for something that can be bought on Amazon for less than $80
You could put this between the device and another router. Someone who would use a device like this would also have a decent router regardless of what their ISP provides.