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@achimsiegmund The schema refers to your business and only needs to appear once in a website for it to be used by an external service such as Google My Business. You can optionally place this data elsewhere, but normally, the front page is the best spot for this.
The Shortcode (or Widget) can be placed anywhere, it is separate from the Structured Data. This is to inform visitors viewing (or reading) your website, The Structured Data is aimed at other computers, so it isn’t human-readable.