Best pratice solution for designing a 50 nodes system cover 100 meter range.

Hello DevZone team, 

Currently, I want to design a wireless sensor system which can cover around 100 meter range.

It can be in any kind of topology: mesh, star, ... as long as it meets the requirements: retrieve data from 50 other sensor nodes with speed is around 1kByte per second.

As far as I know, nrf52840 long range still not available for mesh network design: and if we use normal connection, it can not meets the requirements: 50 nodes. 

Any suggestion on this?

Thank you very much.