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Intel did something similar with four hardware-synced D435s at their tech shack at the Sundance Festival in January 2018. The technique is called Volumetric Capture. With 4 cameras they could capture 180 degrees. In their article about the demo, they suggested using 8 or more cameras for a 360 degree capture, adding more cameras until all the holes in the data were filled.
A company called Jaunt also recently introduced a six-camera 360 degree volumetric capture method that seems to use D415s.
You can read Intel's white paper on multi-camera setups and hardware syncing at the link below: