How to package Quicklook plugins for AppStore
Put them inside MyApp.app/Contents/Library/QuickLook/

More info on Apple developer site.


  When Quick Look searches for a generator to use, it first looks for it in the bundle of the associated application and then in the standard file-system locations (...)


If You do not have any app and only the plugins, I think you can make a single view application describing the plugins or something like this. However I can't find the reference for this.