I believe most are using the USB connection. I've shut off sharing via the clerk PC for our stake as it opens up the clerk PC to attack from the WiFi network. I don't think policy allows you to pay for "computers" out of the ward budget. That may or may not apply to printers.
So I think your best chance is a network server.
However, I think you want to work with your STS to get your firewall configuration upgraded. Otherwise, there's a good chance that the server and the user device will end up in different IP pools where they cannot communicate.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.