It is normal for iris fans to lose a few leaves after planting. Just remove the dead leaves. As for the leaves bending over - they will do that when they grow high too fast but they also may need some water. Iris don't like too much water. But they should be given a thorough drink at least once a week.
The iris are planted with the rhizome at the correct depth but they would reward you if you raise them up and add more soil. The boxes look like you could easily add another 8-10 cm or so of soil which would be great for the roots.
