Thanks for your reply. Your solution seems to be this one : http://www.amazon.fr/Adaptateur-routeur-Netgear-DG834G-Alimentation/dp/B00FMEDJ8E
I am about to purchase an ultimate power supply for my pedal board. Of course it's really expensive but it will be really comfortable for years.
That is why I am looking for a second hand powerfactor or a new Voodoo Lab Digital or a 4×4. I would like to get some advice from Eventide users.