"She requires of her friend that work be done."

This is labled correct as a command subjunctive, but it appears to break the formula:

Bossy verb + that + subject + command subjunctive

in favor of

Bossy verb + prepositional phrase + that + subject + command subjunctive

Is this allowable in general with command subjunctives?
For example: "The high school teacher demanded of his students that their homework be done."

Thank you!