Using SolidCam for machining

I am using a Root controller for my WM16 milling machine, I now want to add a 4th and 5th axis.

So far I have used fusion 360 for 3 axis machining and that has been great, but dont want to pay for professional when I am a home user.

I have started using SolidCam but cannot find a GRBL post processor for it, can anyone point me in the right direction or is there another Post Processor that will work (Fanuc, etc)