Hi Lancorith, yes you can!
The DP output on your card(s) supports two monitors in (up to) 2560x1600p at 60Hz when an MST Hub is used. Our CSV-5200 is a great solution. It enables you to connect the monitors via passive DP to HDMI (1.4) adapters.
Please note that we have not tested a setup like yours ourselves since the Ultrawide monitors, or 2560x1080p resolution is not very common. But dual 2560x1600p via the MST Hub does work.