MV cameras will feel hotter than any other camera you will have previously used due to the computational power in each camera. However, the cameras are designed to run like this, and they have a special heat dissipating metal exoskeleton inside the case which goes around the bottom, sides, and top of the PCB. This is why it feels warm as the heat management is doing its job of moving the heat out of the CPU and other components.
The mounting plate locks into this metal exoskeleton and helps dissipate the heat out of the camera body into the surface it is mounted to.