Buying cheap AC adapters for parts and modifying them into a custom wire-harness that is run from a central power supply is my preferred solution for a problem like this.
The most graceful solution for a setup like this is design a cable harness that includes the wiring for the power to each camera, as well as the trigger sync, and have them branch out in an organized tree.
- All power/trigger/data cables get bundled into shared sleeves that are sized to run from each camera back to one or more central points to minimize the total number of connections you need to make.
- Just remember to keep different classes of connectors as clearly different from each other... Don't cheap out and use the same kind of connector for a sync cable as you do the power connectors... The camera's won't like that. I would also suggest going with a physically different positive and negative connector for your power lines to ensure those don't accidentally get flipped.
With custom length and grouped cables, you minimize excess wiring and maintain a professional clean look.
If possible, I would suggest a semi-modular approach to designing the harness. This will save time and effort if you expand or change your camera array.