I assume that any driver installed that is meant to run an inkjet
printer connected to a USB port must be configured to the USB port and
not to say LPT1. Am I correct.
This is more or less OK. Most USB device driver software must be
installed before the device is first switched on. In the case of a printer,
after it has been switched on you ought to see in
/ Printers / This printer / Properties / Details
a display panel marked "Print to the Following Port" with several
choices. E.g. one of mine shows:
BRUSB = Brother brand USB printer port
and a couple more BR = Brother settings (scanner etc.)
COM1 serial port
COM2 serial port
LPT1 parallel (printer) port
FILE
NUL
and because this is a Brother USB printer BRUSB is the correct setting.
There is another hot button to create yet more ports
I also assume that if I configure a number of printer drivers that
they should all be configured to the USB port if this is the port that
connects to the printer.
Your "number of printer drivers" is not clear (whether you mean
one multifunction printer with a set of various drivers to scan,
copy, print, etc., or drivers for two printers.) Instal routines
for name-brand USB printers instal a suite of drivers in one
automated routine.