According to Dell, the service tag shows it's a Inspiron 5580. The manual mentions the type C port supports Displayport out. I can't tell if a normal type C dock will work with dual displays, but it should work with at least one.
What will the screens be showing exactly? If it's not GPU intensive you could get something like a DisplayLink adapter, so 1 screen can run off that, then a type C to Displayport for the second, then the HDMI port for the last monitor.
EDIT: I would try get a type C hub with two displays first and see if that works. There's also a chance having three external displays may disable the inbuilt laptop display since the IGP can only handle up to 3.