Adding two monitors to xps

@Mike Klaw  One quick note in addition to my post above.  You need to have an XPS 13 that actually has a USB-C/TB3 port.  That means anything from the XPS 13 9350 onward will be fine, and the XPS 13 9350 is several years old now, but if you have an XPS 13 9343 or older, then you won't have USB-C, in which case you'd need a different kind of adapter.

@Mike Klaw  I'd recommend this adapter.  It has two DisplayPort outputs that you can use with your pair of U2412Ms, and it also gives you an HDMI output that might come in handy for connecting to TVs and such.  And it even has a USB-C power passthrough port, so you could connect a USB-C charger to this adapter in order to charge your system, which is handy on XPS 13 models that only have one USB-C/TB3 port.

Anyway, this adapter is called an MST hub, and it taps into the DisplayPort capability available over USB-C ports.  There are also similar multi-display adapters that tap into Thunderbolt 3, which allows them to access more display bandwidth in order to run higher-end display setups compared to an MST hub, but if you only need to connect dual 1920x1200 displays, then you don't need a Thunderbolt 3 adapter.  You didn't specify which generation of XPS 13 you have, so I can't say precisely what display setups you'll be able to run over that system's regular USB-C port, but dual 1920x1200 will definitely be possible.