How many grounding tests?

I've had a look through the FAQs, but can't find anything to either confirm or deny my thoughts on this. I'm fairly sure my interpretation is correct, and I think I've got it wrong previously.

When a unit embarked on a transport fires at a swooping monstrous creature, and the vehicle fires, doesn't that mean the FMC has to take two grounded tests if both the squad and the vehicle cause a hit? As the transport is allowed to fire at a different target to the passengers (BRB, page 78), and we are reminded that they are counted as a separate unit for allocation of victory points (BRB, page 127), they must be separate from one another for this as well.

Similarly, does this mean we can crack a tank with a dark lance mounted on a raider and then hose the occupants with splinter fire from the troops inside the Raider?

Sorry if this is something that's been discussed that I've missed, I just want to make sure my reading is correct!

Yes and Yes.
They are separate units, and as such may fire at separate targets. This is why the 125 standard Kabalite Warrior unit(blaster/venom with 2 cannons) is such a great unit in your backfield against flying monstrous creatures. If you have two of these units you are almost guaranteed to ground a flying MC every turn while moving 12" all the while to avoid fire from other enemy units.

Ok, thanks! I'd just like to take this opportunity to say Muhahahaha! Blasterborn do still have a place in my army as well then, excellent!