FWIW I have been shooting a fisheye at ground level with a single strobe positioned at 12 o'clock for a few years. The reason for that is to use the port shade to block direct lighting of the dome's glass. Lights from strobes positioned to the side ended up striking the glass through the shade cut-out resulting in flare. Subjects are right up to the dome. There are some videos on my web site showing this set up in action for shooting salmon - located under the species listings.
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