For fixing C band lnb you need a feedhorn which comes with most LNBs, clamp can be replaced with other temporary arrangements like chicken wire pieces. I have a very old and heavy Gardiner lnb supporting only single polarity, so mounting it is much more difficult, but C LNBs these days are lighter , so mounting them should not be that hard.
The strongest TP, for a small size dish (around 100cm )is Fashion tv TP 3780V2626.
Yes I got Apstar 7, but only one channel VTV
Thaicom 78e ,again just one channel BEC CH3
Gsat 83e , the strongest TP is Zee Hindustan , I got 65 % signal ,sadly just managed to get 3 TPs from this sat.
88e ST 4TP from this sat.