i do mine on both both off the ground is my first setting with no pressure on servos o do it to hear for it making noises ive burt servos from not doing endpoints and the best way sinc is off ground listen for buzzing if ur car hit maximum steering wothout buzzing its still safe to put ur endpoints a lil less then full steering in case u hit somthin ur servo will be able to flex more without any binding up and possible breaking