All fixtures have to be chained the second they are put up.I have no clue on the CEC code rule but it's common sence and in the fire code as they want them to stay up if they need to pull the ceiling down in a fire.I personaly decked a co-worker by simply touching a panel in a drop ceiling once.Split his head wide open,he was a tough guy but went down like he was shot.I didn't install the fixture but felt responsible all the same.
J-box is the way to go unless you know these lights are listed to be daisy chained.
