About the RAK7289CV2 WisGate Edge Pro Coverage distance

Hello, everyone.
I´m starting a new project in an open area without high buildings, for this project we are thinking on the WisGate Edge pro Gateway based on RAK7289CV2, we need to hear som moudules at 4 or 6 Km aprox.

I have some experience with other brands like Milesight or Kerlink, I would like to know opinons a bout the wisGate Edge field performance and coverage distance.