I am not sure what you intend for the setup, e.g. you ask about interactive rendering. IR can only ever be done locally, not on some remote machine, so was wondering if you were thinking of running the 3D Software (e.g. C4D) on the remote machine and using some remote desktop connection from the Mac to model, render, etc.? Or do you mean to run C4D on the Mac and have the remote PC help with rendering (that is, Team Render, in C4D)?
So as mentioned, IR can only run on the local machine, so in case 2, the PC will contribute nothing to IR. It can contribute for final renders by using Team Render, and you could have either the Mac and the PC rendering, or just the PC. As a note if you are a new Corona user, you will need to purchase a Render Node license along with your main Corona license for that to be possible.