I send DH to Home Depot to get some large 3M brand stick on hooks to hang the "hanger" on. They stick to the door and the sticky thingy pulls right off when we are packing for home. You must read the instructions to make sure you stick and remove the device properly or it will leave a mess.
Our cabin steward mentioned that
DCL is asking guests not to use sticky stuff but I showed him how it is removed without leaving a mess. He loved it and said he would let his supervisor know that they should recommend them over the "over the door" devices.
Happy Sailing!!!
p.s.: DH gets the big green ones that have a high weight support listing. I've hung my large Dooney and Bourke DCL bag on it and it holds the bag and all my stuff in it. LOL and I have a lot of stuff in it.