If they know what is the expected output they can add action to verify the output automatically - so there is no need to manually login to each server and check the output.
In case they still want to look at the output they can extract the relevant part from the log on each server and store into parameter and then use the action "Log to File on Center Machine" to populate single file with all servers output.
Now they can send this file in email or just login to the NAC to verify the file content.