Yes between the ears downward or sideways between the the bottom of the ear and the eye which is approximately at the temple area.
I don’t like shooting straight on because the pellets can penetrate through to the body cavity and mess up the meat.
If it works for you that is great! I am working in close quarters--literally on top of my washing machine, indoors. Down from the top is easiest for me as I am literally pressing against the rabbit's skull, and can control where they position their head, so in my hands the top down would also work with a rifle.
I assume you are working at a bit of a distance, and that is great too, for folks who are more rural. I am smack in the city these days, and have to be a little cautious of the neighbors views. A pellet gun is quiet and would work for me in town, but I would have to put the rabbit on the floor at my feet, and so I would still be above it.
In my location, a pellet that manages to escape the rabbit body would be a big problem, which is why I use the stunner.
I have stunned a young rabbit in the hutch with the rest once, when he managed to get stuck and I could not free him without doing more damage. They did not know what had happened and completely carried on with their normal behavior. I was surprised how well it worked, and have considered doing all stuns that way, but I am still concerned with the neighbors glancing over the fence.
It is a pity that we have to do what is most comfortable for the humans rather than what is most comfortable for the rabbits, but such is the state of the modern world unfortunately. I do my best.