Hello looking for some advice again.

I am fitting some studs to the stock of my walnut AA410, the problem I have is that the stock has the rosewood tip on the fore end.

I am not sure if it will be ok to drill and screw the stud into the rosewood part or if it will be better to come in a little and put it in the walnut part? if it is better to come into the walnut, how much would you recommend that I come in as to not cause a crack?

Also how far in from the butt end would you recommend the rear stud should be? again to help minimise the possibility of the stock cracking.

Thank you for your time, Nick.