You posted in the wrong thread then, instead see this other thread which covers the ZBDongle-E model and many questions related to it → ITead’s “Sonoff Zigbee 3.0 USB Dongle Plus V2” (model "ZBDongle-E") based on Silicon Labs EFR32MG21 +20dBm radio SoC/MCU
Read and follow guidelines in this other thread → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage