How can I throttle multiple ROS nodes at once?

I currently have a three-camera setup that I want to record data from using `rosbag`. However, I want to slow down the video feed from these cameras (from default 30fps to 3fps). I found out that you can throttle a node using However, when we tried to create 3 different nodes, we realized that you can only throttle one node at a time. Is there a workaround to how we can publish multiple throttle nodes parallely. Essentially, we are trying ot throttle the video feed from the 3 cameras. In addition does using the `-r` parameter for `rosbag` guarantee recording at a lower fps since that was the only workaround I could think of