Reflector can run on startup if you set it to within your Mac's System Preferences.
1. Open System Preferences and click Accounts (Users & Groups) in the System row.
2. Click the Login Items tab
3. Click the Add (+) button.
4. Scroll down and click the Applications folder.
5. Select Reflector and click the Add button.
That is it. Reflector will now launch when you startup your Mac!