Chrony configuration to join NTP pool

Hello,
I am the maintainer of the base station OMT1 of the GNSS RTK correction service Centipede.
This base is built around a GNSS receiver with a u-blox RTK ZED-F9P chip and a Raspberry Pi 3B+ computer.
As the GNSS receiver has PPS ability, I have configured the Raspberry as a stratum 1 NTP server with Chrony, following the instructions in RTKbase readme (other usages).
I use this NTP server daily and it works perfectly, so I wish to join the NTP pool. Before I put “allow all” in Chrony configuration file, is there any other parameters to consider, security related or others ?