To help be clear Mocha Pro is not “officially supported” in Resolve. It is supported in Fusion.
That said, we do have many Resolve users that are using the Mocha Pro OFX plugin!
To be specific, we have found the Remove Module to be very slow in Resolve due to their OFX support. For this reason, we do not officially support it as a host. I would recommend doing the trial and seeing if it will work for you.
If everything is working well except for Remove Module, note that you can render inside the Mocha Pro plugin and export the render to file and then import it back to Resolve.
The standalone application is also a popular option but keep in mind the workflow is very render based. Both standalone and plugin can export roto, tracking and new Alembic PowerMesh to Fusion. But to work with Resolve, you need to render clips, render roto mattes, etc. HTH