Other than war engines and units with the Extra Attacks trait, is it possible for a unit to have more than one attack during assault?

As examples:

A standard Devastator squad has 2 Missile Launchers. I presume the those weapons are already factored into their FF value, and thus a squad would roll a single D6.

A Salamander Devastator squad is a little more ambiguous. It carries two mutlimeltas, which are counted as small arms during assault, and this could be taken to imply they have two small arms attacks.

The default is 1D6 per unit during assault, and I can't see anywhere in the rules where it's called out that multiple small arms provide an additional attack, so I assume the small arms listing is only there to show they get the Macro Weapon trait during assault. An I correct?

And I now see this question appears to have been answered in the thread immediately prior to this one. One attack, unless Extra Attacks is specifically called out.