Problem with creating visualization for multimaster ROS system

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I have 3 turtlebots and one computer to control/ssh them. It's a multimaster ROS system- each turtlebot runs its own rosmaster. I group all the individual robot topics in a group so they get their appropriate namespaces. Ex. turtle01/amcl_pose, etc. Each robot saves a map of my lab area and loads it during startup. I am using multimaster_fkie for this setup.

My questions: Can I create a single rviz file, view all the robots together in one map on my computer and all of them performing amcl to estimate their location?

When I run more than 1 robot on the same map, my robot pose gets messed up. It looks like this.

I am unable to figure out the reason behind this.

When I run the minimal.launch file on each robot, all the topics get the namespace except /tf, /tf_static and /scan. When I launch multiple robots together, won't this create a problem? This is how the topics look like.

dslam@turtlebot01:~$ rostopic list  
/diagnostics  
/rosout  
/rosout_agg  
/scan  
/tf  
/tf_static  
/turtle01/amcl/parameter_descriptions  
/turtle01/amcl_pose

Thank you.