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If you look at the source for the openni_camera device_kinect.h you'll see that the kinect doesn't support hardware synchronization.
Based on this, I think you might get interference if the cameras are pointed towards the same area. To solve this in software, you might have to devise a way of intermittently shutting the IR light projector off for alternating sensors (probably by hacking the drivers somehow?), settling for half the framerate (at best). You could make an experiment by connecting the cameras to separate computers and checking what results you get in the overlapping fov.
If the sensors never look at the same space, perhaps there is a way to force them to work simultaneously anyway. I hope you find an answer :)
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