Thanks! I will advise a singular extra ultra wide over a triplehead for a bezzel free experience, and a single monitor will reduce the strain on your graphics card. I advise heavy research and to ensure you have the option of correctly formatted standard widescreen resolutions as well, since you may want standard formats for fps or for practical user interface reasons.
The UI in this game is not friendly to ultrawide setups. You will 100% need Wykkyd multimonitor for UI correction, and it will not look entirely correct. There will be problems with the red combat indicator, how the edges of the UI falls on the screen, and overly magnified splash and loadscreen art.
All that said, I enjoy it immensely, especially for 1st person PvE. I am very fortunate to have the opportunity to experience the game this way, and I'm glad if someone else takes joy from me sharing that.