Keychains are adapted from my other model - https://makerworld.com/en/models/102342
Wall plate in pictures is stuck up using double sided tape (around 1.6mm thickness) to hang keys from.
There's also a Wall plate version with a flat bottom, which should be suitable for use with sheet magnets for sticking to a fridge etc.
Leave a comment if you want any other variations (in size, mounting mechanism, etc.)