I set my mom up with a new desktop and dual monitors (Dell SE2723DS). The monitors are 4k and have 2 hdmi and 1 display port. The desktop has 1 hdmi and 1 display port. I learned that hdmi will not transmit in 4k, although the display port does. The monitors do not appear to have the ability to be daisy chained.

What options do I have to make both monitors display in 4k? Dell said my only option is a docking station but I would rather not spend another 200 dollars. It seems that there are some splitters on Amazon for around 50, or is there a display port cord that has 1 into the desktop and splits to 2?