Go high, so that you have time to recover in-case anything goes wrong.
Also when doing your first test flight, it is recommend using QHOVER and FBWA only, and setting Q_TILT_RATE_DN and Q_TILT_RATE_UP quite low (say 20 to 30 degrees/second).
That was advice given to me by Tridge.
I was also under the impression, that switching to manual from VTOL mode would perform a immediate tilt forward and not wait for target air speed, as FBWA would. This both for emergency recovery (in-case transition fails and you want to save the plane with a dive in fixed-wing mode), but also how else you would you test forward tilt, apart from manually using servo tester.
Anyway there is a new section for VTOL now, I recommend you post there or ask a mod to move it. Also tilt is special, so might as well mention it in the title, not just quads. Quads are fine in arduplane, but from what I am seeing, tilt is till not too popular and needs experimenting.