My recent install was quite high up in the pilothouse and ~3' off the centerline, haven't had any issues resulting from
installation location (and always had issues with my old
fluxgate compass setup even though it was installed as prescribed).
However just remain aware that these things are still very sensitive to magnetic
interference. As a result of mounting near centerline etc the
fluxgate compass was far away from potential
interference, my EV1 not so much. I mounted it in very convenient location (because it could be off center line) underneath chart table, I casually placed my tablet on the chart table above it and it
lost its mind. Not sure if it was just the
electronics in general or the magnetic clasp on the tablet case, but it sure scrambled the EV1's brain.
So all I'm saying is yes it seems you can put it off center and up if you need and it's easier, just still try to put it as far away from potential interference sources as possible.