For me hip height is not a focus in the first 60m to 70m in a 100m race. As most footballers do not run much more than 30m to 40m in a hit up or in preparation for a tackle I do not believe there is any advantage trying to get the players to achieve such.
My background with sprint training of footballers is with Rugby league and Rugby union, the majority of what i did was for acceleration up to 40m with the focus on making and taking a hit. It is my understanding that an athlete who practices high hip height will not have a good step required to avoid an opposing athlete whether in attack or defence.
It is my understanding that a former successful sprinter from Australia could not accelerate fast enough to be accepted in the US college system as a football player (10.08). This could well have been because of his hip height being at the right height too early.