We consider the following 2 options to be the best – the OceanTray and the Uni-tray.
The Uni-tray is made of strong and lightweight delrin (reinforced plastic) tray, rubber grip handles and the famous locline arms. You can position them in every way – for Wide Angle or Macro. It also folds easily for travel and carrying without disassembling. This type of tray is more affordable than the 2nd option.
If you’re looking for a rigid, more rugged system, the OceanTray is a versatile ball & joint tray and arm system for underwater housings. It’s made of quality aluminum materials, with rubber O-rings on the ball mounts to provide a better grip for the clamps.
Both of these trays are perfect for compact and mirrorless systems.
You can check them out here: