No there are no sat in the middle 5e is at R 0,7 and 7e is at L -1,5.
I do the azimuth and elevation with the 5e at R0,7
Then the skew at 28,2 and 12,5w (far east and far west)
After that i check the elevation again.
I do the dish callibration with the original plastic LNB holders.
After that all the fun starts to put all LNB in place and finetune each LNB.
As i use the exellent PLi image in my DM 7020 i can use the PLi satfinder streamed to my laptop.
Its a hard work but someone has to do it