I would not install it without a disconnect for the line side, you will have to clean and service the ATS sooner or later, and do not want to have to get the poco out to shut it down for you. I would look into a sound attenuated housing for the genset, the ones I have been around while running are really quiet, at 15 feet you can have a normal conversation while it is running. I think I would put a disco on the emergency feed from the genset, if for no other reason than to protect some un-knowing soul from an automatic start up of the genset. Just my opinions.
