IMHO, the R9 was born to be worn in the rear pocket. I have 2 rear pocket hosters from Jeff Stoner (513)4243800. They are of very good quality and won't break the bank. The first was called a right handed grip, where, one grasps the gun with the palm facing the rear. I have found that the gun hangs up on the pants material while drawing. Besides that, you are drawing the gun across the back before putting it into play. The so called left handed rear pocket holster puts the right hand palm forward, between the gun and the rear facing leather. This leads to a smoother draw and quicker presentation.
My advice, with whatever rear pocket holster you decide upon, simply specify palm forward or to the rear to avoid confusion.