The following is general advice for GoPro action camera arrays. For more information, please seek advice in our community or directly from a commercial rig maker.
Shoot at high FPS
GoPro camera arrays (and DIY camera array systems in general) typically suffer from synchronization issues. All cameras in the array will not start together, and they need to be synchronized in VideoStitch Studio to avoid visible artifacts (cameras not moving together). This synchronization is accurate down to a recorded frame interval.
In order to reduce the synchronization artifacts to the lowest possible value, it is recommended to shoot at the highest possible frame rates. On a 6x GoPro Hero3 black edition array, recording at 100 fps allows you to stitch more than needed for web publishing.
Shooting with a static camera array allows recording at slower frame rates.
Lock the white balance
VideoStitch Studio provides automatic white balance adjustments. However, for best results with these cameras, it is highly recommended to lock all cameras' white balance to the same value.
Field of View
If you use a commercial rig setup, you want to follow your rig manufacturer's settings (in most cases that would be wide FOV).
Be aware of rolling shutter
Consumer cameras often use rolling shutter sensors that can introduce visible distortions in the videos. These distortions can become visible in the final stitched video.
Finally, make sure all cameras in the array use the same settings :)