There are two types of users that can launch surveys and see results:
#1: Full Administrators, HR Administrators, and HR Assistants
Any user with these privileges can launch a 360 survey. However, HR Assistants are not allowed to view results, whereas full Administrators and HR Administrators can.
A manager is able to launch reviews on any of their subordinates, by default, at least. If ever you would like to prevent managers from launching 360s (and appraisals), visit Manage Account > Appraisals and Surveys and uncheck the box under "Launching Appraisals and Surveys"
A manager can launch surveys on not only their direct reports but of anyone else under them. In most cases, our clients find this very useful but if ever you'd like to 'cut off' that access to anyone other than direct reports, send us a message at firstname.lastname@example.org and we can walk you through the process.