Potential therapy for Covid-19

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Bats hang upside-down.
While doing so, gravity is helping pull the mucus out of their lungs.
Could partially emulating this "strategy" help treat humans with Covid-19?
There is already a technique called gravity assisted drainage (GAD) that has been used for bronchitis.
https://bronchiectasis.com.au/physiotherapy/techniques/gravity-assisted-drainage
I'm thinking that having people sit upright in their hospital beds is even worse than having them lay flat.
Before I found GAD, I was thinking it might help to have patients lay in a declined bed and also apply a vibration to the bed in order to help assist breaking the mucus loose and draining it out.