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I hope you were able to first display one laser data atleast in Rviz/

Create a \world frame and with respect to that create two new frames called \laser1 and \laser2 on to which the data from different lasers is published. This can be done by setting the frame id in the header of the messages that are being published.

Then in Rviz, display two laser display plugins and set the target frame in Rviz consistently.