Build it as a second ReelSet with .orientation('horizontal') -- one reel (.reels(1)) whose .visibleCells(n) is the number of symbols in the strip -- and add it to the stage above your main set. It is a normal reel set, so it spins, lands and cascades with the same API. There is no single-call "banner" helper; the two sets stay independent and you position them yourself.
AnsweredMultiWays & Megaways
How do I add a top horizontal reel (extra strip above the board)?
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