XPS 13 9343, four daisy chained monitors from mDP out port?

The Intel GPU in that system, and in fact all Intel GPUs even today, only support three total independent displays, counting your built-in display if you were planning to use it while you had external displays attached.  So you can either run 3x external displays with the built-in panel disabled, or 2x external displays plus the built-in panel.  There's also a bandwidth limitation.  If you want to run 3x displays off a single DisplayPort 1.2 output, the max resolution you could have per display is 1080p.  If you wanted to run 2560x1600, you could only run 2 displays, and if you wanted 4K, you could only run 1.  All of those figures assume the standard 60 Hz refresh rate.  Lastly, note that using DisplayPort daisy chaining (or DisplayPort MST hubs if your displays won't have daisy-chaining connections) can still be a somewhat finicky process, so be prepared to jump through some hoops to get things set up and maybe put up with the occasional aggravation going forward, such as some displays not waking up when you return to your system, etc.