Nagging me to install the app before I've even seen the site is a sure way to get me to leave and never return.
If you simply must toss up one of those uber-annoying "Please install our app! PLEAAAAAAAAASE!" popovers, at least do me the courtesy of letting me look at a couple of pages on the site first. How am I supposed to know that I want your app when I haven't even seen your site?
Otherwise my answer is going to be not just "no" but "HELL, NO!"