Your belt buckle is 12. Right hip 3. Center of back 6. And left hip 9.
The law does not dictate how a firearm is carried openly. You could tape it to your forehead and be legal.
I carry just behind by right hip, about 3:30 to 4:00 o'clock, so it does not stick out as far.
If you are a lefty, and you have a holster on your right side set up to draw with your left hand, that is called a "crossdraw".
When you say your friend wants to carry on his "backside", I assume you mean with an inside the waistband holster. As long as the firearm is plainly visible, it should not be considered concealed. This is how schwarzi88carries.
(2) (a) "Concealed dangerous weapon" means a dangerous weapon that is covered, hidden, or secreted in a manner that the public would not be aware of its presence and is readily accessible for immediate use.