It is 50% possible to receive both these SATs on one dish but few TP of both SATs.you require 3 lnbs with scalar rings.you have to hunt St2 first &fix the dish. Then without disturbing dish you have to fix both lnbs .Upper side will Asiasat7 & lower side Intelsat20. If you stand front of dish Asiasat lnb will be in left side &Intelsat20 on right hand side.If you got only 2 lnb you can remove Central lnb without scalar ring.