Use both vertical and horizontal cover/structure! See the following for info. Use vertical cover in deep water so that all of the pond is productive not just the shoreline.

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92463#Post92463

Here is what Ray Scott did with his famous LMB lake. Note both types of cover and locations.


[Linked Image from forums.pondboss.com]

One bit of info to address your question;
"Underwater diving studies have shown that artificial habitat of which the fish prefer most, stands a minimum of 1/2 the water depth, with 2/3 or more being much better. Objects standing from bottom to surface were utilized most by the largest number of fish, bugs and creatures."