project discussion

Hi,
I am in the planning stages of a LoRa project to read soil moisture and basic environmental variables on a farm.
From what I understand, I can only use one sensor device with the 1-channel gateway (?).
But would I then also be able to use multiple sensors with the 1-channel gateway if I used Real-Time Clocks (RTC) on the multiple sensors transmit boards each sending at different times, to ensure there were no transmission collisions?
Or would something else be a better option?
Thanks.