An update on this for anyone else in the same position:
* I tried booting Ubuntu 18.04 off a USB drive, given this is what the displaylink driver officially supports.
* I installed the displaylink driver.
* The Ubuntu GUI display manager didn't work properly (it didn't let changes get applied etc), but I could see both monitors there.
* xrandr could configure the monitors vaguely sensibly.
* But... the result was not usable: the mouse pointer was flashing all over the screen for some reason. So I gave up and rebooted back into my Fedora install.
And when Fedora booted, it magically displayed on both external monitors and the built-in display. The dock now appears to be working perfectly fine. And there are no issues with the mouse pointer flashing all over the screens.
Summary: it is almost as if the dock or the laptop needed to be set to a certain mode to work. The Ubuntu driver did that, and Fedora for some reason couldn't.
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