I start mine about 3" above the rim of the pan with a 600g batch.
The pan would be about 1/2 full on start up.
I havenr measured but at a guess the nozzle would be about 7" above the surface of the beans.
This is without the lid of the BM on.
A smaller batch is trickier because of the heat blowing back on the gun.
If you try for the same starting distance it doesnt work the same.