My box has 2 satellite tuners and 1 freeview tuner. I assume all tuners can be used at once?

The satellite tuners work fine but the freeview tuner doeesn't work. I've added it as:
  • Tuner C: DVB-T2.
  • United Kingdom
  • All regions, United Kingdom, (Europe DVB-T/T2)


Then I did an Automatic scan on Tuner C.

On my VU+ Duo 2 box I would exit all menus then press the Down arrow on my remote. I would got to Providers > Unknown. That was where the freeview channels would appear on that box when I used a USB freeview tuner. However on my Tiviar Alpha+ box that has a physical freeview tuner as a part of the box, when I go to Unknown I can only see standard definition channels and none of them display a picture. When I try to display any of the channels and I press the OK button the channel info popup on the bottom of the screen says it's a HbbTV channel.

How do I get the freeview channels to appear and in HD?

How many channels can be recorded at once with a single freeview cable?

Can I use a splitter to get 2 freeview cables? I will plug the second cable into a USB tuner.