Acoustic foam panels mount

I want to create simple way how to mount my 50x100x9cm acoustic panels from OBI to wall on existing paintings hooks or 3d printed hooks mounted with double sided tape. Spikes needs to be pushed to foam under angle so base is flushed with foam

Maybe little more acceptable solution for wife/girlfriend. Of course, the foam must be wrapped in a white cloth. 

• Printed on FLsun SR (Klipper) with azurefilm petg transparent