Shallow dock fish habitat ideas?

What are the best ideas for shallow water docks as far as fish habitats?

The deepest portion is the back with six or seven feet while the front is only two.

They can't put anything under the dock because it's a small dammed lake that fluctuates a lot.

It's on a shallow cove just off the river channel?

Should we put the habitat just off the sides?

Also what do you suggest? Concreted buckets? Prc?