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Isn't Freeview just the name for the over the aerial digital tv. It doesn't matter whether it's a Freeview box or another digital tuner in a box or tv, the channels are the same. The Freeview specification is that it adds internet connectivity and IPTV, is it a digital channel rather than aerial?
But if you really need a Freeview box does your monitor not have a HDMI or DVI port to plug it into?
You can get a variety of TV tuners which can work with your PC, Hauppauge are a big brand. I'm not sure which are Linux compatible but plenty will be as lots of PC use them for HTPC setups.
Or you can get a network tuner like this https://www.amazon.co.uk/Silicondust-HDHR5-2DT-HDHomeRun-CONNECT-Tuner/dp/B07BFNRGN9/ which anything on your network can access. This will work with Linux (I use it with Ubuntu and Kodi on mine).