I'd host it on both webservers. The script sets the A record to all the servers that are online. Obviously, the script als has to check it's own service.
It seems a little hacky though, for a business use case I would use another approach.
Your challenge is that you need a loadbalancer. By hosting the loadbalancer yourself (e.g. on a VPS), you could also host your websites directly there...
My approach would be DNS-based. You can have multiple DNS A records, and the client picks one of them. With a little script you could remove one of the A Records of that server goes down. This way, you wouldn't need a central hardware.
True. I really wonder why they're not tackling the issue more. It seems that there are several different areas to adress, from farming to industry to vehicles.
No USB power plug operates at 5 V when providing 65 Watts. That would be 13 Amps. Both power plugs most likey use 15 or 20 volts internally. 19 volts is not allowed over USB.
Edit: Here is a short summary of the USB-PD spec from Wikipedia
I'd host it on both webservers. The script sets the A record to all the servers that are online. Obviously, the script als has to check it's own service.
It seems a little hacky though, for a business use case I would use another approach.