Bet you found that it doesn’t fit exactly, right?
I position mine so that the front block is as close as possible to the front corners of the cockpit floor, but that means it ends up a few inches back from the cockpit corners.
The rear blocks get positioned close to the rear corners, but if your lift is like mine it falls short in length so I put the blocks just forward of the corner and catch a spot between the seat depression in the floor and the side rails where the body bolts are. Seems as good a couple of spots as any.
Play with the lift’s positioning front to back, inside/outside until you feel comfortable with block placement and it seems to lift the car with good balance and then either remember where the blocks were or mark the underside of the chassis to help position them again, later.
Don’t forget to also use jack stands under the chassis once you get it raised up, for safety sake.