Place Revit host-based families by CAD block location using Dynamo (issue in detecting the host from linked model)

Hi
I was trying to make a dynamo script to Place Revit families by CAD block location using Dynamo and it did so but my script is useful only for host-based family
I am trying now to modify it for host-based families but I have an error for Host input as shown below
Can anyone help me or give me a better idea for my script
thanks in advance

Hello dont think you can host your family to your ceiling…have you tried family instance by point…probably it will work for you