That arc already has quite a lot of satellites, I'd say enough to choose for a motor:
28.5, 30.5, 31.5, 33, 36, 39, 42, 45, 47.5, 52.5, 53. 54.9, 57 East (though some will not make it there with 100 cm I suppose).
Treat your Triax right this time, with just one LNB on its (not-so-sturdy) arm!
Edit: these photo's are over 4 years old, but nothing changed since then, except the LNB is a IBU single now.
Totally unshaded range is 36...66 East, and 26...72 East still acceptable.