Mouser offers u-blox ZED-F9P-GNSS module for robotics
ZED-F9P RTK GNSS receiver board with GNSS Active Quad Helix Antenna
ZED-F9P RTK GNSS receiver board with SMA Base or Rover
u-blox - Drotek Releases Sirius RTK F9P GNSS Rover. The RTK version of the Sirius GNSS comes with ZED-F9P u-Blox module,providing 1cm position accuracy, a convergence time under 10 seconds and a
High precision GNSS multi frequency centimeter level low power consumption UBLOX ZED-F9P RTK differential GPS module - AliExpress