I say just connect the wires to the device. Why introduce another connection to the equation?
No debate there at all
It would have to be taped up to keep out paint and drywall mud.
They may come with the pigtail in a little baggie...splice it up....put he baggie on and leave it in the bag while other trades do their thing/s. It's a typical set up that LV guys do as well.
....let's not forget, I doubt the 50% claim.