no EPG from some DVB-T2 mux

[sub]

Generally you'd only scan one DVB-T device, then on other devices you'd accept it's offer to copy the configuration from the setup device. This way you end up with the same channels on each, and they auto merged, so that any device can be used for each channel.

It doesn't matter which device you scan first.

[arimak]

Yes, in case I'd use the same antenna source cable for both tuners...

It isn't important now, but I use Astrometa for real terrestrial signal (DVB-T, DVB-T2) from local transmitter.
The Leadtek Winfast I use for UPC cable provider (they broadcast both DVB-C, and DVB-T through the cable, about 4 DVB-T muxes are for free, not coded, for something like backward compatibility for TVs, boxes,... that can't decode DVB-C,...).