New answers tagged rich-snippets
No, you don’t need Review items for getting the Aggregated Rating Rich Snippet. See their examples: Aggregate rating examples Aggregate rating with no best score Except for the AggregateRating item, they only contain the item that gets rated (Book in their case).
Your example of the hierarchical layout is very close to the suggested usage of the mainEntity property suggested by the official protocol documentation: As mainEntity definition "indicates the primary entity described in some page", this is a perfect fit for your case, so my suggestion is that you choose this well structured code, Google should understand ...
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