OK. 28.2 unicable LNB to tuner A. 19.2 Unicable LNB to tuner B.
Tuner A would be set as advanced, unicable, select manufacturer, select model/device, you only have 1 LNB on that tuner, select satellite (28.2), select SCR of that LNB
Tuner B (bottom slot of satellite card) has its own signal supply, it is not connected through another tuner. You also only have 1 LNB on that tuner. (Some people change that to LNB 2, that is wrong). select the other satellite (19.2), select SCR of that LNB. Remember this LNB is different to the one on tuner A, so SCR may be the same.
You now have 6 more tuners to configure. Decide how you want to split them. For arguments sake, lets do 50/50.
C, D, E will get signal through tuner A. You only have on LNB on that tuner, so LNB must remain 1. select manufacturer, device, select same satellite as tuner A (28.2) , set independent SCR for each tuner of those tuners. They are all connected through tuner A, so ensure that the option is enabled. Select tuner A as the one they are connected through.
E, F, G will get signal through tuner B. You only have on LNB on that tuner, so LNB must remain 1. select manufacturer, device, select same satellite as tuner B (19.2) , set independent SCR for each tuner of those tuners. They are all connected through tuner B, so ensure that the option is enabled. Select tuner B as the one they are connected through.
There is a guide to taking screenshots in my signature. If you cant see it owing to mobile view, link is here: https://www.world-of-satellite.com/s...o-attach-files
For thoroughness, you can combine multiple Unicable LNBs on one tuner. But they have to be programmable. The programmers are not cheap. Will be cheaper to get a unicable switch that takes multiiple wideband LNBs such as the Whyte one. Keep an eye out on ebay, you sometimes get them pop up for less that £30. But as you said that you are buying other receivers, you might be able to use the tuners through the other receivers.