Is there a keysafe that will.stick on an internal wall.

[Elderflower14]

Ds2 who is deaf and autistic lives independently. He sometimes forgets his house keys which means having to walk to his support house for the spare which isn't always ideal.
He needs a keysafe but Im not sure the building owner would be happy for the internal wall to be drilled. A friend sent me the link to the one that can be looped round a pipe but there isn't anywhere suitable. Does a stick on key safe exist or I am being daffy??

Think I've got it sorted. Think we can get a loop one and put it round the bannister.

Would swapping to a keypad entry work instead for the future?

Thanks that's worth a thought. I'm getting him a ring doorbell too. He's very hot on security. His support team did all the work on his tenancy. He never met his landlord and landlady for 18 months. One day they were due to do some. Work and he videocalled me and shoved his hand through the door chain. There was a very surprised couple... "We are W's landlord and landlady.. Do you think he will let us in now??" 😂 😂 😂
I'm buying This and will fix to the bannisters so it dangles down.