Hi I would like to know, if it's possible to add two displays to a Thunderbolt or USB3 Dock (like Belkin, or OWC, or such). It would need to support one WQHD Display (e.g. a Dell U2515H, NOT Apple Thunderbolt Display) and one 4K Display, and the integrated MacBook Pro (latest fully spec)'s display should keep running. Both, or at least the WQHD should be driven at more than 30Hz. Is this possible without the need to use the HDMI port on the macbook pro?