I have can light backer boxes and HVAC "baffle boxes" between some of my joists.
Is there any reason I shouldn't run the hat track along the bottom of each joist? As in parallel to the joists so the HVAC baffle box can rest on the drywall?
Everything I read assumes a perpendicular installation.
Yes, Running every joist may be too close together if the desired spacing is 24 inches
Some clips require two screws and the spread is too wide to hit a joist
Assuming you had 12 inch spacing and put the track on every other joist that would mean you are hanging the ceiling weight on just half the joists rather bringing all into play
As for the HVAC baffle box your channel does not have to be continuous so you can cut out a bit for the box. Just put a clip on the loose ends.