This is mine.
Far left of left monitor is the app that shows track grip and that's all I use it for. Under that is FFBClip. Right side of left monitor ptracker at the top and at the bottom I have the pedals app because sometimes I pedals can spike or not go to 100% and I need to replug them. Also have the assists next to that just to remember what I have on or off.
Middle monitor has the track map top left and PLP under that, then the quick chat window bottom left. Bottom right is delta. Helicorsa is horizontally centered just just above eye level.
Right monitor has Wally's tyre pressure app and sometimes have the tyre app above that.
I have my wheel rim display showing me my gear and I have nothing showing speed. When I used to have a G27 I had dashmeter pro on my phone on an extendable clip connected to my monitor stand.
Mine is triple 24s and I think it was 70cm to middle screen. I use an online calculator to calculate the correct side monitor angle which was 45 degrees. Then just used the triple screen app in game to set the correct FOV.