Recommended Way to locate executable folder and preferences folder on Linux

I am trying to troubleshoot an issue that a user has installing Inguz
plugin on their QNAP Server, which seems to have a proprietary file
structure.

The code that I inherited, isn't too fussed about where the executable
is installed, but expects the preferences to be saved into a folder
/usr/share/InguzEQ

I can amend this, but was wondering if there are any environment
variables that are available irrespective of platform that I should use
or whether there is a convention that I should be adhering to. My
reading indicates that installed applications should have details held
in /opt  e.g.
/opt/InguzEQ.

Any advice appreciated.


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