You maybe correct Defendi that I'm over thinking the concept of a missiles and torpedo launchers.
I'm a retired submarine sailor and an grew-up as an USAF brat which has given me a chance to look it stuff like missiles, torpedoes, and ammo for cannons. The limitation of a single missile firing mechanism on a piece of ordnance (SM: P VM p. 92) or mount (SM: P VM p. 107) just doesn't jibe with the stuff I know about in the real world.
Torpedoes, from my experience in submarines, are loaded into tubes, one torpedo per tube. Of course the reason is that to torpedo has to get from the dry environment of the tube to the water without flooding the people tank, aka pressure hull side where the crew are dry. Early warships that carried torpedoes had multiple tubes, carrying 1 torpedo per tube, mounted on a trainable base that provided a firing arc.
Missiles, from my interest in the military, follow the same basic pattern of 1 missile = 1 firing mechanism. In order to get more fire power, someone decided to build a frame around several firing mechanisms, load them with missiles, okay rockets, and the launch them in the direction of the target. Today, there are a number of systems that have multiple firing mechanisms mounted on a single frame that can be adjusted in azimuth and elevation.
The vertical launch system designed for Tomahawk missiles is a box with multiple launchers, firing mechanisms. From the discussion with MarkC this is is not valid for missiles in SM: P, unless I call them torpedoes. This is just working for me.
To me the only differences between SM2 and SM: P is effectively guidance, EW, and engagement duration. Torpedoes are bigger and house better guidance systems, have EW, and can track a target. Missiles are smaller, faster, with limited range, and basically no guidance systems.
I have just taken a strong dislike to missiles and torpedoes in SM: P and SM2. Of course if I can ever get this straight in my head I'll change my very feeble and old mind.