Enterprise MFA "add-on"?

the warning on the MFA page suggests that there is an add-on available for Enterprise MFA:

the usage of the word add-on suggests that this could be added on to e.g. the Essentials plan but is that actually true?
Or does one have to upgrade to an Enterprise plan?
Additionally, the wording adds an extra layer of confusion since the factors are called enterprise MFA but are available already on the professional plan.

one further layer of confusion is that this documentation suggests that Phone message and Email are not both available via the addon:

Rather, Email is only available on Enterprise here?

Alex

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Thanks
Dawid