Universal lnbf means it receives whole Ku band freq... ,you need not required separate lnbf for receiving lnb low and high freq.. ,and it receives both H&V signals. For V 13 volt & H 18 volt swithing option is their. When you are entering freq... , please follow the freq.., chart carefully because in polarisation column in the receiver you enter correct pol..,anothervise receiver cannot receive signal on perticular freq..,
Better purchase branded lnbf one with low noise temp... , because noise temp.. , is more signal receiving strength is low.
Regarding dish antennas there are different types.As you mentioned in the question , in C band mesh antenna it is possible to receive the Ku band signal but the hole in the mesh should not large,Ku signal should be strong enough.In fiber and solid C band dish antenna it is easy to receive signals compare to mesh dish antenna.
Offset dish antenna or offset feed it is commonly called Ku band dish.The offset focus configaration is used for small dishes designed for use with medium to high power semi-DBS and DBS(direct broadcast service) satellite operating in Ku and Ka bands. It is really a section cut out of a much larger parabola. The main advantages are that the head unit is out of the way of incoming signals, so it wont block the signal.It is quite difficult to install,the actual elevation setting of the dish itself is reduced the angle of offset.
Regarding receivers i dont have embeded or CI slot receivers i have only FTA receivers .our RDI friends may help you on this question