Hi,
Mango does not require tomcat. Please see our installation documentation here: https://help.infiniteautomation.com/support/solutions/folders/14000092094
Mango also uses port 8080 by default so there is a conflict with tomcat. You can either shut down tomcat or change Mango to run on a different port in the env.properties file:https://help.infiniteautomation.com/support/solutions/articles/14000020052-installation-configuration
Hope that helps.