For small low-tech tanks, glosso or monte carlo could work as carpeting plants in such setups (both can adapt to growing with a combination of excel and ferts). Just that their growth rate will naturally be slower than compared to Co2 injected high-tech tanks (may take months to grow out, instead of weeks).
Having more plants at the start helps to establish the carpet faster though, so try to plant as densely as possible.
When you have carpet plants, the shrimps will naturally hide in them if they can, especially after molting as they prefer a safe place to strengthen their new shells. I guess it helps to reduce their stress levels when a tank has high plant density for them to hide and forage in.

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