Four wheel, absolutely.
But that 15 degree off-center may be an even bigger problem. Even if nothing is obvious with the steering system on the rack, the wheel should be centered before doing the alignment. Failure to do so results in the ball joints at the ends of the steering rack being not the proper distance from their corresponding steering knuckle joints.
As the wheel moves up and down, the knuckle joint moves in an arc. The length of the rack link is designed such that its end joint as it moves through its arc will closely follow the arc of the steering knuckle joint moving up and down. Failure to follow will result in induced steering inputs, often called “bump steer”. Repeated alignments without straightening the steering wheel first can change the lengths of these links sufficient to make the steering wheel off-center and make them far enough off to begin to induce bump-steer and adversely affect handling.
And you could easily have damage hiding under there. This needs a close evaluation by a competent tech. If there’s no damage, a proper alignment needs to be done, starting with straightening the steering wheel… and I do NOT mean removing and reinstalling it, as I’ve seen done before. It establishes the starting point for adjustment of the components.