FAU is binding, UCF is nor binding, UCF actually encourage you to do better and apply out.
FAU final interview will have 15-20 students. 5 weirdos will be weeded out very quickly. The other 15 are classified as 10 admits and 5 waitlists. 2 admits with 1 waitlist as a group, total 5 groups. If both admits say yes, waitlist is out. If any one of admits say no, waitlist one is in. If all three say no, they do not get out of their way to get more. So yearly, max 10, but on average 8 students. MCAT requirement for FAU is curved based on GPA. You can still stay with a low 507. Where as UCF, it is a straight cutoff 514, bit tougher.