Rough-in kits / pre-construction brackets are versatile and are inexpensive. However, you don’t necessarily need them. Because the appearance of a room can change so much between the framing stage and the finished stage, it’s more prudent to do your final speaker placements when the room is completed.
It’s always smart to have a general idea of where you want your speakers mounted in the framing stage, and to
run the wire out into the desired stud bays on either side of your preferred location while it’s still fully accessible.
Speaker placement, however, should wait until the wallboard is up, and you can look at the room as it will be when you’re living in it. Then it’s only a matter of using the simple installation systems both in-wall and in-ceiling speakers provide to secure it to the drywall. That being said, we do carry some brackets for some brands.