You can do all that. Just make sure leaves are exposed to light. Plants will grow to orientate themselves towards the light.
If your tank is not filled yet, you can dig a shallow pit. Spread them over the pit and sprinkle gravel over them.
If filled, you don't want the back breaking task of planting them in individually or in 2s and 3s, and you can bare the ugliness till they spread, you can separate and plant them as clumps.
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