Zend certified PHP/Magento developer

How to add more than 3 monitors to my laptop docking station

I have a Windows Surface laptop with a Docking station. The docking station has 2 HDMI ports and one VGA port. This gives me a total of 3 screens while I work at my desk.

I was wondering how I would add an additional 2 screens and what my best option would be? I tried USB to HDMI, but could not get the extra screen working. Can I buy an additional docking station or is there other hardware out there that can provide me with what I need?

Any suggestions would be appreciated as this is a first for me and I need some assistance in my search.

Thank you