This bracket will fit perfectly between your Locator-U1 and your existing GoPro mount.
Some ROVs come equipped with a GoPro mount as standard. This bracket is a perfect fit for those.
The bracket is mounted to the Locator-U1 using two of the three M3 holes on each side. So by shifting which holes you use and which direction you mount the bracket (front, center or back of the Locator), you can achieve three different placements of the mount.