Chungjh:
Toe-in angle is critical in a small room. Symmetry and Equal distances from back and side walls must be achieved for a balanced sound field. A quarter in matters…
What are your dimensions?
As well, in near field listening, equal optimal bias on your panels is very important. I found that more toe in works, and careful bias adjustment for centering image provides a greater soundstage presentation.
I have a similar size panel in a smaller room setting and these adjustments were important to achieve best performance. Let your ears determine guide the optimum adjustments.
Ken