I am pretty sure that not all branches in the code have been tested especially since I own to bridges where both bridges have a single lock (due to the distance between the locks in relation to Bluetooth comms between lock and bridge). The plugin 'should' support multiple locks per bridge but I cannot easily test that without creating a bridge emulator.
Also, as per the README, if you have multiple bridges, you will need separate domoticz HW devices per bridge each with their own free port (bridge1 8008, bridge2 8009 or any other free port on your system, and so on).
I have been running it in test myself and so far so good

Herman
ps: thanks for dnpwwo for nudging in the right direction here and there
ps2: The plugin currently uses s.connect(("192.168.1.1", 80)) and s.getsockname()[0] to get its own IP for the callback url. This will definitely cause problems for those on a 10.XX.XX.XX network adressing. Need to fix this urgently. If anyone knows how to get domoticz' IP address then please send.