What brands and systems are most of the customers using? If they're using their own base stations I'd hope they already drove their own fields. 


But that's where the big differences come in between systems is how the base station was surveyed, and lesser the datum used in the background. 


If you're doing it for people that mostly run free or lesser signals then you're ok, but they can't really use that boundary anyway very well since their own signal drifts in the field. 


I don't think you'd want anything that uses base stations and radios since I assume you're traveling around doing these and won't be line of sight to your base. So that leaves cell RTK like Digifarm or JD mRTK or satellite based signals like SF-RTK