Here 3 RTK GNSS with base : Drones, UAV, OnyxStar, MikroKopter, ArduCopter, RPAS : AltiGator, drones, radio controlled aircrafts: aerial survey, inspection, video & photography
DJI Phantom 4 RTK w/Base Station Ready to Fly Bundle - Drone-Works
Tarot 650 Drone RTK Kit add-on
DJI Matrix 300 RTK Thermal Pack - Drone Parts Center