Where can I find a Powerline Internet Adapter with DIN Rail Mounting?
EDIT

I found it! 
Just search for DEVOLO DLAN DIN



EDIT

Something like this but not sure if it exactly waht you want.


The only way is going to be to hack them and do waht you want. I have not seen anything like this for DIN.. even though i thought of it so many times.. because it makes sense. It will have to be something like this.



Essentially you will need to put one of these(below) in that (above)..



But I did find this on Search Engine