Follow along with the video below to see how to install our site as a web app on your home screen.
Note: this_feature_currently_requires_accessing_site_using_safari
I definitely don't think a footprint is "too broad" for finding links... they're specific enough to find the exact pages that you can build links on and broad enough to allow you to find a heap of them.
The operators you mentioned are definitely useful for other stuff but really aren't that great for finding pages to build links on. Limiting yourself to just one URL or whatever isn't going to help you find a diverse range of place to build backlinks at all.