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I think you can activate when you want, I would probably do it halfway down the screen and then if they scroll up, capture it then, atleast. I think you can also do a custom add to home screen instead of the default.

I'm a huge fan of Technical SEO, there are a few slides if you search this topic, that will help guide you, but hope you have some programming background with a specality in data

Incredibly well put together, even an add to home screen function? I would probably change the time / placement of when that pops up, otherwise very well done, development wise.