thanks!
So if I got it right, to overcome the limit we can:
1) open different virtual machines and install for each one SmartPSS
2) Install SmartPSS different times using kind of different names, and run them simultaniusly
3) Export the config and import another one, to see other devices.
In my case none of the above solution can be good, I'd need to provide a PC that can show all the cameras with one click only. I guess to do it with SmartPSS, the exacutable should be edited, so I probaly have to see for a different program