I think you are going to find it a bit disappointing unfortunately.
At this time MSFS isn’t exactly good at multi-monitors … in fact it’s kinda bad.
There are no options for field of view or angle of the screens so at best you do three screens nearly flat across. Once you get your stretched and out washed out on the edges view you’ll notice issues with ground lights looking like beach balls from miles away and soft focus in the center of your screen at night.
The one saving grace for you is that you are using Track-Ir so the edge focus gets sort of hidden.
Many of us with multi monitor set up and even some with just ultra wide screen monitors are keen for a fix, please vote.