Tvheadend

Hello,
I am using tvheadend 4.2.8-34 on RPI 4 8 Go (raspbian buster 32)
Pi hat TV work well and I want to add Geniatec T230 an additional tunerStick USB to have 2 tuners
I tried with Hauppauge Win TV duet tuner but it doesn't work with TVheandend (but work with plex server...) and couldn't get help on the forum. is Geniatec T230 tuner easier to operate because it is also recognized but I can't get it to work

If this tuner also can't work, which tuner should you buy to make it work with the pi hat TV already in place?
Should you directly buy a dual USB tuner and remove the pi hat TV?
Which dual DVB-T model should I buy?

Thanks for your help

Samquad