As pointed out, a lot has to do with how you normally dress. Me, I almost never tuck a shirt. Retired don't have to LOL. So concealing a G19 is easy with a good kydex holster designed specifically for the gun and with good retention.
I us a Dara with a 15 degree cant and medium ride height and carry it at 1 o'clock. Close to appendix but just slightly to the rear. The 15 degree cant allows the muzzle to clear my leg when sitting which I found a straight appendix carry configurations do not. Also, if I have particularly tight pants on, this holster will work inside the belt but outside of the pants provided your untucked shirt or jacket is long enough to cover the muzzle. For me this is usually doable.
I might point out however that since Texas legalized open carry, I worry a lot less about someone noticing I'm carrying. It's not against the law unless posted. No one has ever noticed. I think most people are not that observant unless it's in-your-face obvious. Too busy looking at cell phones I think.