To protect yourself, download from trusted sources (XDA Developers threads with community verification), verify file checksums when available, and run a reputable antivirus scan before installation.
If your device is already certified for Dolby Atmos (such as many Samsung, Motorola, or Sony models), you do not need a third-party APK. How To Install Dolby Atmos On Android dolby+atmos+dax335128r1apk+full