I’ll give you a few tips that I enjoyed in my setup.

Trifield:
1. Max width 1.5, gives better integration and lets more sound into the L R.
2. Remove the xover cutoff in the sides/rear if you have full range sides/rears.
3. Position the 3 fronts on a circle equidistant from listening position.
Depth affect the timing of the centre in relation to the L R. Every .5 or full sounds different in timing.
4. If you made L C R equidistant from your listening position consider depth 0.