I could explain better if you can focus on the image attached here:

Can the hover line height be shown only up to the max line height (Please see the image below)
I do not want to show the hover values for first and last week. (I mean on hover of 'week 0', I do not want to show the hover boxes, same as for 'week 7')
Can I set the floor and ceiling for the each series data, Some thing like
series: [{ name: 'CPM', data: [5,524,4,1,4,1,3,20,3], color: 'rgb(87, 188, 0)' //floor: 5, //ceiling: 524, },{ ....} }]
Is there any such floor/min and max/ceil for the each data set.
Such that the other two series data gets visible in the chart. please refer this fiddle
How to show All Data Series Fiddle jsfiddle.net/4vzEt/21/

tooltip.formatter check this.x and return false when tooltip shouldn't be displayed.Your image is saying something really different than 2) .. to remove that vertical line, just disable tooltip.crosshairs.
To change order of points, you need to use tooltip.formatter - sort points descending and return formatter string.
References:
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