The third monitor should use wireless display adopter:
https://www.microsoftestore.com.hk/partner/product/MS-4K-Wireless-Display-Adapter?locale=en\_HK
But monitor is 30 Hz refresh rate only. (The color is not the same)
Or try this one
https://www.microsoftestore.com.hk/partner/product/wireless-display-adapter-new?locale=en\_HK