@killYRidols if indeed you have a stable configuration and the Excel sheets would not change I think I would go for the 10 Excel Readers. You could also configure a meta table and tell this table what sheets to use and what IDs to join and tell the Excel Reader to allow changing formats. You might have to store your file from the main workflow after each iteration and read it back like in this example:
So this is possible to do but if it is only 10 static sheets you are better off doing it separately and see if something goes wrong in-between.