What would the rationale be for having multiple unlimited Permutations? My understanding is that a Permutation (Basic or Unlimited) can be used to protect multiple products. The difference is only in the number of protected methods.
From security standpoint it is recommended to use different permutations for each product. This way you get diversified protection by not using the same transformation for all the products. There is nothing to prevent one using one Permutation for multiple products.