Does the monitor support FreeSync over HDMI? Last I looked which was some time ago, there were almost none availble. What resolution are you aiming at, because you could run into throughput limits on the cable.
1.DVI connection has no Freesync support
2.To enable Freesync in 3 monitor Eyefinity configuration you need 3 identical monitors with DP MST support or 3 identical DP monitors and MST hub or 3 DP outputs.
3.For 3 FullHD monitors you need 1 MST hub or 1 DP output for daisy chain connection or 3 DP outputs
For 3 WQHD monitors you need 1 MST hub and 1 DP output or 2 DP outputs for daisy chain connection or 3 DP outputs
4.Maybe it will work if one of monitors will be connected via HDMI ,but i am not sure