Yes. An Openreach engineer, (or a subcontractor to Openreach such as Kelly's or Quinn's), installs a VDSL2 filter on your master socket and installs a modem close to that.
The router that Plusnet provide now does sound to be worse than the previous one, which was adequate but not brilliant. In my opinion it's still worth having for the cost of the postage, and making your own mind up about it when used on your line for your sort of usage. See how it goes before lashing out cash on something better. It also means you have a working spare if anything you buy falls over.
You can put the router up to 100 metres from the modem. You just need a long enough Ethernet cable.
With the Plusnet router you get a little installation book that gives you the essential settings for connecting your own router. The fancier settings of course depend on what you buy.
Billion and ASUS are popular alternative routers.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 59999/14372kbps @ 600m. - BQM