I have rented houses at Emerald Island, which is only about 5-10 minutes from the parks. There are 8 bedroom homes, which say they sleep up to 16, but these are privately owned homes, and I'm sure if you have small children or offer to pay more/leave a larger security deposit, they may not have an issue with 3 more people in the home. I rented a 4 bedroom and had 9 people. The owner of the home never asked me how many people were staying there, and no one counted us when we arrived, so I'm not sure how they would know how many people you bring with you.
Don't forget the lawn guy and the pool guy come round and if you are outside or have an extra car than what would be considered the normal number then they go back and report to the MC who has the right to enter the home and check on numbers so the owner does not violate their license conditions .Plus if the owner does not know how many people are in the house -which they should do - what if there was a fire -how many people do the fire men look for?