First, I am not a medical professional, but with COVID-19, whether you are or not, no one really knows how it affects everything, especially inorganic items. That being said though, it is highly unlikely that COVID-19 would be an issue as you could have each H520 sit with a controller for 72 hours prior to help. If you really do have concerns, have all the people involved wear a mask and gloves. They need to use fresh gloves every time they touch something (for each contact point)other than the drone(one person per drone and controller). For example, when you handle the drone and then want to touch the controller....fresh gloves or it is going to cross contaminate and negate any precautions you have just made.
One person, one set of gloves for each contact point/item.
New contact, new gloves.
Do not use hand sanitizer when prepping for glove use......only soap and water.
If you have access to a face shield, this will work as good as a mask for outside.
Finally, remember these key words/phrases.......common sense, cross contamination, soap and water.
You always see people out shopping in gloves, that is the most ridiculous thing you will ever see as it is a clear case of cross contamination and spreads every germ that is on that object to the next.