I'm installing my first one handle tub/shower valve and the directions are pretty specific regarding height off floor(33" for valve & 78" for shower head) and distance between valve and tub spout(6" to 11"). Are these locations merely what's most comfortable or are they crucial to the proper functioning of the tub diverter? Say, for example, someone wants the valve at 48" , shower head at 84" and distance between valve and tub spout at 24". I'm guessing that the given locations are important to the proper functioning of the diverter. Or maybe the distance beween tub spout and shower head(max 57") is the crucial distance?