SkEye works fine using my Nexus 4 phone or Nexus 7 tablet when attached to my 90 mm Mak - the OTA is aluminium, so not too much steel to upset the compass. It works fine if I just strap the phone or tablet straight onto the OTA with rubber bands, but I also bought a cheap clone "GorillaPod" style tripod on eBay (the ones with the bendy legs) , which has the advantage of being able to mount the phone display in the most convenient orientation.
The nice thing about SkEye is that it allows you to use the pointing function with your phone / tablet mounted in any convenient orientation, not just perpendicular to the display, and this makes it a perfect app for mounting your phone as a Push-To guider.
My suggestion: download the SkEye app and try it with your phone strapped straight onto the OTA - if it looks promising for you, THEN investigate whether you need a more sophisticated mount.
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