How many max HDMI outputs can 1 thunderbolt 3 support?

I have a Lenovo Yoga X1 and would like to extend my display to 3 monitors for better productivity. The laptop itself has 2 thunderbolt 3 ports, I would like to know is there a docking station that can turn 1 of those 2 thunderbolt 3 ports to 3 HDMI ports to which I can connect my 3 monitors or do I have to purchase 2 docking stations and populate both thunderbolt 3 ports?