**editorial question: is "maintain at or above" a specific altitude instruction?
I would think that such a direction would be wholly dependent on 2 things: first, where the airplane IS; and second, the minimum safe altitude for that location. I would presume that the minimum safe altitudes (including whatever that might be for the area, and where they would be safe/legal to be at the minimum altitude referenced), would be available to the flight crew somewhere in their information on the destination airport.