I am in the UK and do get Freeview off the Rumster Forest transmitter.
When I started recording/watching TV on computer I had an August T202 on an old Toshiba laptop. After I started using Kodi on an RPi3 I bought another RPi3 and added a TVHat to the second one. I switched to a Hauppauge WinTV DualHD TV Stick. The setup with 1 RPi3 running Kodi to watch DVDs, ripped DVDs and recorded TV and the other acting as a TVHeadend server worked well.
I then bought an RPi4 hoping I could go to a single machine - not to good if I tried recording 2 TV channels and watching from ripped DVD.
Currently I use a Dell Optiplex i5-6500 (second hand from Amazon) which runs Kodi and acts as the TVHeadend server - it works really well.
I also have Kodi and TVHat on the RPi4 in my "office" totally separate from the main system and that's OK.