I got a bed laptop stand from AliExpress, used it when I had back problems and had trouble being in any position except lying down. $15 and worked fine with my laptop. The same item on Amazon:
https://www.amazon.com/Laptop-Adjustable-Ergonomic-Aluminum-...
Saving $3500 is a powerful motivator for a lot of people.
I was trying to find a used/rent/borrow arrangement for a device called a log arch a few years ago, to help with a landscaping project. This is how I discovered just how many people have learned to basic to intermediate welding to avoid the labor costs of having someone else do low-volume work for them. Especially out in the boonies.
http://www.ergoquest.com/overbed-workstations.html
These contraptions cost more than my car... But they do seem to be safer. Nothing hanging above the user's head.