I'd start with two of those plants; one on each side. Plants are hides, too.
If you can find half-pots terra cotta those are really good. So are Cichlid caves or stones (Google both). Pleco spawning caves need to have an opening on both ends. Not sure about the opening for shrimp tubes; you'd have to contact the seller.
If your dog thinks you are the greatest do not seek a second opinion