Payload_Place questions

Hi all, just wanted to ask if anyone else has dug into the payload_place mission command? I can’t get any good data beyond descent alt “other than zero”…and this is the hangup, as I am trying to work out if a landing deliver is possible. Is this even possible with standard params and mission commands? Sim is hit or miss, and wanted to see if anyone had IRL’d something like this. Thanks in advance!