Thank you for your responses, highly appreciated.
No the company is just a manufacturer and has no such services.
After reading and trying to digest some more info, I ordered a Behringer ECM8000, looks like there's no escape from some more homework...
Also updated my initial plan as follows. 60 * 60 * 260 cm corner traps plus 60 * 120 * 20 cm traps around listening position. I intend to fill these with 50kg/m3 rockwool, that I found is sold quite cheap in 60 * 120 * 10 cm layers.
The IKEA bookshelf on back wall full of books will hopefully act as a natural diffuser too.