Don’t mention it. 
They come in both conventional & addressable versions; the type you’ll need depends on the panel the system will have.
Yes, but then you have to worry about annoying your neighbors anytime the system activates (though you still would if it was any other kind of noisemaker such as a horn).
You could, but I’d say that there’s no real need to (though I suppose you could put just a remote strobe to avoid annoying your neighbors).