I needed a wall mount for my MetroNet fiber optic modem (Nokia) and couldn't find one. So I fired up Fusion360 and modeled my own. Hopefully, it'll help you.
I couldn't find the model number for the Noika modem, but take a look at the photos and see if it looks about the same. The dimensions of mine are 82mm wide x 105.5mm long x 37.5mm thick (including the feet).
The author marked this model as their own original creation.