Robert at Meco makes a Billy holster that's a belt slide that also keeps the R9 very high on the belt. And the Billy holster can be worn left or right side, strong side or cross draw. It is lined as well, which makes for a nice draw and helps protect the finish of the pistol.
The High Country by Ryan Grizzle rides about as high as an R9 will get with an OWB carry. Due to the length of the barrel, it hardly drops below the belt level at all. He also makes a Town & Country IWB that is outstanding.
If you can cover to an inch below the belt with a shirt or jacket, you can cover the pistol with either the Billy or the High Country. Of course you would want more to allow for movement, but these holsters ride very high. In terms of quality, each is excellent and you can't go wrong.