I used this thread to create LibreOffice app icons for Writer, Calc, etc. with Automator, moved them in Applications directory, then executed LaunchPadder to sort all with default config (Apple, Type and Alphabetical enabled) and noted that these new icons are located with Apple apps.
Example of Automator app content:
open -n -a /Applications/LibreOffice.app/Contents/MacOS/soffice --args --writer
I used this thread to create LibreOffice app icons for Writer, Calc, etc. with Automator, moved them in Applications directory, then executed LaunchPadder to sort all with default config (Apple, Type and Alphabetical enabled) and noted that these new icons are located with Apple apps.
Example of Automator app content: