Regardless of your roof type, hurricane straps are designed to help hold the roof to the walls. Ask your builder to install hurricane straps of galvanized metal. Don't wait until after your house is constructed; although some people attempt hurricane-strap installation as a do-it-yourself project, the straps are difficult to fit, and improperly placed, they can turn into sharp projectiles in a strong wind.
Designers recommend placing seats back at least twice the width of your screen, but also a few feet away from the back wall, so you can savor your surround sound. If you don’t want the rest of the house to shake, invest in heavy carpet and padding to absorb sounds. Don’t automatically assume basements are the best place for a home theater (they’re prone to flooding). But if the basement is your only option, don’t run wires or cables along the floor.