[wrxtasy]

That was for @Kyle1125

You need to run either:

a) an external TvHeadend server with that tuner on a RPi, Intel or AMLogic LibreELEC Box. Even then I'm not even sure the tuner will work on a AMLogic LE Box.

b) Run whatever TV Server Software comes with that USB Tuner on an External Intel machine and then download the corresponding Android HomeFree TV App. Even then I'm not sure that App will work on Android TV. If its a tablet App expect trouble.

Please read the PVR Wiki.
I seriously doubt you can Plug N Play that USB Tuner into the Mi Box.
The Mi Box's Android/Linux Kernel will not have the required USB Tuner driver support. In fact I know of no USB tuner support on the Mi Box at all.

Custom Firmware would be needed. But that's impossible because the Mi Box's Bootloader is locked down tight.