The possibility of silent installation depends on how did you install Headwind MDM launcher.
Headwind MDM allows silent installation of applications in the following cases:
1. You've used QR code based enrollment (works on most Android 7.0+ devices). Here is the manual how to enroll using QR code: https://h-mdm.com/quick-start/
2. You used adb to set Headwind MDM (com.hmdm.launcher) as device owner. This requires developer SDK: https://qa.h-mdm.com/1411/
3. You have signed Headwind MDM launcher by system keys or installed it in the firmware in the priv-app directory.
If you installed Headwind MDM launcher by simple installing the APK, silent installation will not work, even if you grant all permissions the launcher asks for.