Well it does add up when buying all 3 for Left-Center-Right.
The HDS will work nicely, but as mentioned you won't be able to set them on the floor or ceiling, need to bring them up to ear level.
Got to comment on your first picture. I thought, they're huge, pushed up near some sheets of MDF near those blocks. They're several wall-blocks high. Why isn't he getting bass? .... Then I saw the other pictures.