I already searched in this forum but unfortunatelly didnt found any advice yet. I really would appreciate if someone has an idea!

The situation is the following: I am a Newbie with Resolume and I have to prepare some footage for a live show. Actually its not a VJ-Show, its more that I am producing footage which has to be screened during the performance like a scenery/backdrop for a theatre/dance performance.
My question is: The screen size will be 40ft x 9ft. That means one beamer (if its not a "Barco" or "Christie") wouldnt be enough, so I guess I need at least two up to three projectors (EB-Z8350W) to fill this huge screen with my output picture.
My Question: What is the best way to realize that? Will a Matrox Dual/or Triplehead 2 go be the right choice? Which settings I should choose to get the best result?
Again: Its one output picture for a huge screen, I dont need several layers screened on several screens.
Any ideas?

Thank you very much!!!
All the very best,
Tobi