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 the site using the built-in Safari browser.
I'll echo James and say you'll be good but adhere to his guide on the landing pages. Also, you can use the URL identifier tag in your schema to help nail down which GMB goes to which page.
The link you provided is to JSON markup. Did Google switch from backing Schema to backing JSON? Or is JSON complimenting Schema? Admittedly, this is not my realm of expertise.