These look great on your door frame, I would suggest a little bit of adhesive putty like in the link below. This is a layered print and this is meant to be printed on a Bambu with AMS or Multicolor printer. Makes for great wall art, or you can scale it down and add a magnet on the back for a magnet.
We have a lot of great stuff over at the Patreon: https://www.patreon.com/WilliamsIndustries
Adhesive Putty: https://a.co/d/0SXex0u