All caps is from the old school Casper Suite days as we make Jamf Pro now. But when it's a logo it is lowercase and when its used in writing the J is capitalized. Little known fact that it's actually a soft J so its pronounced "Yamf" and the pipe between Jamf and the product name is silent, e.g. "jamf | PRO" isn't Jamf Pipe Pro, its just Jamf Pro. Some of this may be less than accurate.
If you're talking about a machine address then it doesn't really matter since the important thing is spelling out the word "address" after the acronym for "clarification".
If you're talking about the Apple product then its Mac and only ever in the singular tense.