Welcome to the community,
I don't know well Scrum of Scrum, but you can have one board for all teams (running parallel sprints) and use a customfield or compoment to differentiate which issue belong to which teams. You can add quick filter or even swimlane to distinguish issue of each team.
adding to what Mohamed said there might by also some additional information available from Atlassian Agile Coach, a nice collection of supporting information when it comes to Agile Topics.
A completely different idea, some out-of-the box thinking: here in Community there is a separate group dealing with Agile recommendations:
Feel free to check and ask details in the Group - many users interested in Agile topics are there.
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