That is a picture of Bill Atkinson's setup. He recommends the slanting 55 degree or so. This will help prevent runs more than anything. I don't slant as much, about 1/2 of that. I also don't have the advantage of converting my garage to a spray booth as Bill did. Just won't work for me. I have a converted bathroom instead.
His setup is better and if I was only doing 100% canvas I would attempt to improve on mine, but I can get by up to 36 x 72 and that' as big I prefer to stretch anyway. Biggest advantage Bill has is that he can setup a 36 x 72 horizontally I can't do that.
ONE critical thing I have learned. If you get off the Wagner guns, you will have a whole lot less overspray, as the the more expensive guns will let you control both spray amount and air flow. I am in the process of converting right now. Bit of a learning curve again, but worth it.
Breathing Color has a video somewhere on their site that talks about this also, i.e. setup of a booth.
Paul