Anything leather can do, kydex can do better. I'm a traditionalist, it took me a long time to admit that.
Especially if there is any cant, the holster will have to ride a bit high to accommodate a cut-out for the RMR.
I have a box full of holsters I've tried. Wish I could have all that money back.
Learn from my mistakes, save yourself some time and expense, and give KM Custom Kydex a call. They'll explain what you need and why, and I haven't found any better quality then theirs.