How can add cisco router shape to Network atlas and show the real status of its interfaces .
After you add the router object to the map, you can change the graphic.
From the manual you do it as follows.
To monitor the interfaces, you would need to add them to atlas by either other objects or you can monitor a link between 2 objects (the link has 2 end points that it monitors and if either goes down, link will go red).
Check out the manual, it's pretty comprehensive.
https://www.solarwinds.com/-/media/solarwinds/swdcv2/licensed-products/network-performance-monitor/resources/product-gui…