To answer your first question, who knows? It is up to the person running wires to run them best he see fit at the time.
As for placement, there will be roof joists up there, try and locate at least one and maybe two and drill into them to attach the mount to. I have lots of stuff on my roof, (two AC units, two solar panels, a TV antenna, a satellite antenna, a radio antenna, not to mention the skylights and vents. Everything so far has been up there some of it since 2005 with no problems. Most of it is simply screwed through the roof sheathing and then sealed very liberally with Dicor Lap Seal. No problems.
|