Need Mac Acrobat default save loc. to EITHER be specific location, or LAST LOCATION USED IN ACROBAT

Let me stop you before you respond—no, this isn't Acrobat's default behavior on the Mac version.

The Mac version defaults the save location to the LAST SAVE LOCATION USED BY *ANY* APPLICATION, OR BY THE MACOS ITSELF.

This is not helpful or useful as a default, so I want to change it to something helpful/useful.

Is this possible?

I simply need it to default to one single location, the same location, never a different location, every time, as in, 100.000% of the times that I select the SAVE AS command, or select the SAVE command for a document that has not been saved.  Ideally it would be a specific location that I am allowed to specify, but at the end of the day I just need it to NEVER CHANGE UNLESS I TELL IT TO.