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Yes, it appears that's a requirement, to use Enterprise-level account with Survey Monkey per their site. I haven't found a related source in the Tableau Forums on that requirement.
I'd also recommend reading this thread prior to migrating that direction. There appears to be some work needed on Survey Monkey's side with their API; they do appear to be responsive to user's needs, so they are working things out:
Hope it helps! Thx, Don