Yes, that directory also works. From what I have written it is clear as to why it works as well, but many people might prefer to use a "plugins" subdirectory for clarity (as the QT install does).

I didn't mean to hard-code the path. Obviously you should determine the path at startup with something like:

QDir plugins( QCoreApplication::applicationDirPath() );
plugins.cd( "plugins" );
addLibraryPath( plugins.absolutePath() );