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I guess it depends on how installed, but my smartctl is in /usr/local/bin. This is, of course, the same information as provided by DriveDX. If DriveDX does not show it, then smartctl doesn't.
smartmontools-7.5.dmg is the latest official release of smartmontools for macOS and it installs into /usr/local/sbin
smartmontools-7.5-r5714.pkg.jpg
https://www.smartmontools.org/wiki/Download#InstalltheOSXDarwinpackage

- smartmontools is free, DriveDx is usually $25
- smartmontools has been updated on 12 May 2025. The latest release of DriveDx is from 25 September 2023.
 
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