I know this is an OpenPli site but I use a Linux box (Zgemma H7S) with Openvix which works well for me. Took a bit of sussing, but got there in the end. Also have a few non linux boxes that work well on 27.5W.
I find the easiest way is to setup the dish on Hispisat 30W and get a picture, then rotate the dish back towards 27.5W until the picture freezes. This should put you close enough to find a signal to setup 27.5W (11495v.) to then be able to fine tune. Works for me although I did find that a 50cm dish was borderline in Spain and Portugal so normally used a 60cm in good weather and 80cm to cope with rain fade. I used different dishes when traveling with the Motorhome