@ashton F.S. 117.05(2)(a)
“The fee of a notary public may not exceed $10 for any one notarial act under this part, except as provided in s. 117.045 or s. 117.275.”
For clarity - 117.045 refers to fees to solemnize marriage (which is whatever the local court clerk can charge) and 117.275 refers to fees for online notarizations.
Although I see your analysis of two people, each acknowledging or swearing to, usually only one certificate is issued - therefore, $10 per acknowledgement or jurat.
JMO