Hi Mysha!
Thank you for bringing your question to the Disney Parks Moms Panel!
What a fun trip you have planned! We did something similar in 2010 and brought 23 family members for a race weekend. It was amazing!
I think that you would definitely need more sleeping space than a two-bedroom villa can provide. Depending on how you plan to sleep, the three separate rooms would be a great option. If you call a
Disney reservations specialist at 407-939-1936, they can help assist you with making reservations for multiple rooms. They probably won't guarantee you to be close to each other, but we have always been accommodated when we've had more than one room on our trips. Our adjoining room requests have even always been met. A Disney travel specialist can also help you with suggestions on your rooming needs.
Another fun option would be the
Treehouse Villas at Saratoga Springs. You may want to look at those, too!
I hope this helps! Please let me know if you have any other questions.