Jerry I recommend to keep them on a USB stick.
I do exactly the same thing you want to do.
It works with no problems.
Just remember
*to take backups of your usb stick time to time to insure against a possible
damage to the usb stick
*take into account that you need to remember to bring the usb stick from
home to work and vice versa.
(actually even if you forget it, you can still work on ON, but without the
latest changes made on the other computer.
Conditional on that you do not modify the same paragraph in a page, ON will
sync the next time, everything between the two computers)
The idea to keep the On files on a network drive is not appealing to me.
Because it has to egt connected to the network which is most of the time
takes time and is problematic.
Also, if the connection is slow, it will take some time to sync the changes.
The USB option is the best I think.