My instructions said to use no up or down thrust and 2 degrees right thrust. My firewall was perpendicular to the fuselage axis in both planes. To get any thrust adjustment would require shimming the motor on the mount or the mount on the firewall. Shimming the motor on the mount with the engine at a 45 deg angle would result in unwanted vertical thrust adjustment. The mount would have to be shimmed on the firewall to get pure right thrust. Just moving the mount around on the firewall wouldn't have any effect on thrust (OK - a minor effect if it was off axis).

I mounted my engine and mount at zero-zero and the Sukhoi flew fine.