Same - I slightly misread your post. Soz.
The screws for that are on the top side of the gimbal mounting plate, and to get to that one needs to completely remove the camera/gimbal.
Those screws arrowed. The other three screws are what holds that plate to the drone body, and have to be removed from inside … after removing bits.
The way it’s assembled, and from my experience replacing the MP Gimbal Mount … and Gimbal, I’d very much doubt that plate can be out of its correct position.
Edit: you can see here that that hooked plate is well set into the main gimbal plate, too. It’s VERY secure! 
