Usage of multiple PX4s in offboard mode

Hello, I am using PX4 to control my drone with ROS2, and it is working. I am planning to build two drones, and I anticipate facing an issue in this part because having two PX4s means having the same topic names. When I researched this problem, I came across works done in simulation environments, and I tried them in simulation, and they worked. However, I am wondering how to achieve this in a real system. Can you help me with this?
I have reviewed the PX4-Autopilot software and attempted to modify the ‘dds_topics.yaml’ file located at ‘PX4-Autopilot/src/modules/uxrce_dds_client/’. However, the changes I made to the ‘topic’ sections in the file did not take effect when I attempted to upload it.

see [Bug] Two PX4 boards cannot be used simultaneously in offboard mode · Issue #22587 · PX4/PX4-Autopilot · GitHub