I mean that if you use pristine device and then install SFOS (custom Cyano+SFOS) on it, GPS may not work, unless you have at least once started it up with proper Cyanogenmod and set up GPS.

Moto G device I have has been in used as a loaner device for a very short time while the original phone of the user was in repair. It had stock Android Kitkat from Motorola when I got it.
I flashed it directly with custom Cyanogenmod and SFOS, both by PiggZ, and then started the phone.

It is quite possible that GPS has never been enabled before. And definitely it has never had cyano on it before, as I had to unlock its bootloader with an unlock code requested from Motorola.

I'm not sure which would have been more important in my case; turning GPS on in stock Moto ROM before flashing it, or turning it on on "stock" Cyanogenmod, like how I now fixed it.

I just remembered that sometimes custom ROM makers suggest turning all features on before flashing them. I tried that as a last measure to get the GPS fixed, an it really worked.