T - bar fixtures. 2x4 lay-ins. Is the 4 integral clips on the fixture suffice to code 410-16c? This is the type that has to be bent from the fixture over the ceiling grid. They're pretty flimsy and unreliable, especially in a shaker out here in La. I always would use 4 tek screws to the grid. I have a contractor here that says the integral ones are fine but the manufacturer will not say either way if they back thyem in a shaker.