Hey @Matej-1036 ,
Thank you for your question in our community. This is a good question and as far as I know there is not a way to share multiple assets with one link. This is a good idea though I can see there being some good use cases for it.
I am looking into the GO anywhere if they can be shared the same. I dont have one right now to test right now but I am having someone to test and will let you know.
I think your idea of giving a customer a restricted access user who can only see one group and cant make any changes is a good idea. I would just make sure you are setting up their clearance and group carefully when you add them so they can only view and not making any changes and nothing is being shared with them you dont want to share.
Let me know if you have any other questions.
Have a good one!
Eishi FUN