Advanced In Car Technologies
Okkkk. After doing countless installs of an RNSe, the best place by far is on top of the vent system.
With the unit out, follow the top plastic in the hole, you will then find a gap to the left or right, once you've doin it you can then just push through a little further and you will feel a ledge. I always place them on there. I usually expect to see 7-9 sats depending on where I am.
In regard to going off position, this is normal on first install. The RNSe has to calibrate itself. Should be ok after the first 5-10 miles.
Hope that helps.