... how can I make sure that all device drivers are 64 bit compatible ...
So simple - ask the device manufacturer! Couldn't be easier.
If you prefer, you can check on your own: Simply go to the device manufacturer's website and see if they offer a 64-bit driver for Windows 10 for your device. Just be sure that the driver is for your particular model.
Otherwise, simply contact the device manufacturer's technical support or post a question in the manufacturer's own community forum.
I did this before my clean install of Windows 10. It took a couple of hours of work, but after it was done I knew for sure that my devices had 64-bit drivers.