The screen you listed is a adequate entry level model. Elite can sometimes be hit-or-miss, but they certainly make a very price-conscious product. If it shows up and works great, then great. But, if you have issues with the screen, then it can be a fairly tiresome process to get the screen taken care of. Hopefully that won't be the case. It still remains a fact that the same sized screen, in a higher quality fixed frame design, runs less than half the price.http://www.amazon.com/Elite-Screens-150-Inch-SableFrame/dp/B009WNUK4C/ref=sr_1_2?ie=UTF8&qid=1429373075&sr=8-2&keywords=sableframe+150
But, I use a tab-tensioned screen and it does work very nicely.
For mounting distance...http://www.projectorcentral.com/BenQ-W1070-projection-calculator-pro.htm
The distance you list is right in the middle of the available throw range. The lens to screen distance must be between 12'7" and 16'4". So, 14'2" is right between the two. Anywhere in that range is an acceptable distance.
You must mount that projector so the lens is about 3" above the top edge of the screen. You have about 1" of wiggle room on that. So, get a mount which offers proper height adjustments. I recommend the Chief RPMAU mount, which can sometimes be found on eBay for about $100.
If it goes for under $100 you have a deal, and the cheap mounts on Amazon are just that - CHEAP. There is no better mount that I have seen on the market, and buying a projector then using a cheap mount is akin to buying a nice sports car, then putting cheap gas in it. It just doesn't make sense.
Moreso, because when you buy a good universal projector mount, it will last you 20+ years, while the projector may only last 7-10 years, and the screen may be done by 15 years or so.
Anyway, the W1070 isn't really a quiet projector. It's kind of small and has somewhat noisy fans to cool it down. It doesn't have whiny fans, so you won't be annoyed by them, but you certainly will hear the fans in the W1070. That's back again, to the Sony HW40ES, which is not only a solid step up in projection quality, but it also is a nearly dead-silent projector.
You DO want a projector directly overhead though. Sound comes from vents on the sides/front/back of the projector. Not from the top or the bottom of the projector, so sitting under a projector is one of the best locations to have sound directed away from the seating position.
Depending on your situation, you can also put in a hush box to quiet the noise to the seating location, or just put in a piece of plywood or similar to help block sound from traveling downward, while leaving plenty of ventilation for the projector.
Hush boxes are sealed boxed design with good ventilation, to feed cool air to the projector, and exhaust hot air away from the projector into another room. They seal the noise from the room the viewers are sitting in and take it to another space. It's not that expensive, but takes a great deal of planning to do properly.
- Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.