deadlifting for back

I already deadlift (full rom), but when deadlifting for back, where is the best place (for safety and effectiveness) to rack the bar. i guess i’ll only be doing the top half to two-thirds of the lift, and was thinking of racking the bar around knee height or just above. any ideas??? thanks ppl.

what do you mean by racking the bar? I think you mean where do you start the bar in the rack. If this is the case then anywhere from knee level to 3 inches below the knees.