Don't use MCP's Over-The-Shoulder option in conjunction with the MGE settings, as they will conflict (I believe the MCP description of the feature details this)
Third Person Crosshair is an MGE mod, and which version you need depends on which version of MGE you use.
Are you sure that they conflict? MCP's description says to use MGE to adjust the camera:
Moves the third person camera to a position over the right shoulder. The camera position is fixed; if you want to adjust the camera position, using MGE 3.8.2 or later will allow you to do so.
I'm using MGE 3.8.0, and I can't seem to find any version later than that. I've figured out how to zoom the camera in, but I can't seem to zoom the camera out.
Also, I've been able to find a third person crosshair mod, but apparently this mod is incompatible with MGE, according to several comments on the mod. Unless I'm missing something here (which I probably am).