Spendor broacher advertising shows their speakers facing directly forward while their Frequently Asked Questions shows toe in aimed at each ear at the listening position which appears to be a very slight isosceles triangle.
Using a familiar or proper recording I'd begin with the manufacturers triangle instructions. Moving a wheeled office chair slowly nearer and farther after any location adjustment may offer you some insight in determining the staging.
My speakers were designed for wide forward facing. Using an approximation of the golden thirds speaker and listening positioning has yield massive staging and acoustical speaker disappearance in my very reflective room.
You could hire an experienced dealer to do the setup. Best of luck with it.