Directly under your app name from the root folder? /appname/
Or under a standardize folder like:
/app_data/appname/
/app/appname/
/etc/appname/
/var/appname/
/safe_app/ maybe?
Picking the same one seems like a good idea to keep everything clean for the user.
EDIT:
Ah, nevermind, reading this indicates it’s already handled by the launcher.