Multi UAV drone simulation with camera on each drone

I wanted to perform a multi UAV simulation using PX4 SITL in Gazebo simulator and control the drones using ROS over MAVROS. I wanted all of my drones to have a downward pointing depth camera. I noticed that the folder PX4-Autopilot/Tools/sitl_gazebo/models contains a model called as iris_downward_depth_camera which I feel would be suitable for me

I tried to use this model in the launch files multi_uav_mavros_sitl.launch and multi_uav_mavros_sitl_sdf.launch by changing the vehicle argument and adding the sdf argume