If you place a ruler / straight-edge along the bottom of the handlebar (so it points forward, parallel to the bar, sort of like in the screenshot), the angle it makes gives you a point to set the bottom paddle of the shifter. I was once told. I've used this as rule of thumb and it seems to work pretty well for me :-)
I just place the bar wherever feels comfortable to cruise with the hands on the drops and then put the shifters pointing slightly upwards, almost flat. I guess is personal preference anyways
If you place a ruler / straight-edge along the bottom of the handlebar (so it points forward, parallel to the bar, sort of like in the screenshot), the angle it makes gives you a point to set the bottom paddle of the shifter. I was once told. I've used this as rule of thumb and it seems to work pretty well for me :-)
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