I used to Appendix carry exclusively until I was injured in an accident and due to the lack of mobility I put on quite a bit of weight. Since then I have switched to Strong Side carry at the 4:00 position. Luckily, most of my holsters are adjustable and can be used to carry in either position.
For single stacks such as my PPS M2, I use a Vedder Light Tuck Deluxe or something similar. The one thing I really like about the Vedder is the unique design of their belt clip which allows you to switch between straight up/down as used for Appendix or Cant for Strong Side carry. The one thing I didn't like about it was there was no option to add a "Claw" so when I contacted them to see if they would modify their design to allow me to install a Raven Concealment Systems (RCS) VG "Claw". While I was on the phone with them I found out their factory was only 20 minutes from where I live so it made it very easy to discuss the modification. They gladly made the modification and it turned out to be one of my favorite holster designs. Evidently they liked the idea as well because about 3 months later they started offering their own "Claw" design as an option.... LOL
If you are looking for a double clip holster for Strong Side carry holster you may want to take a look at the Clinger No Print Wonder holster. I've tried a lot of them (CrossBreed, Alien Gear, etc.) but for me, I like the Clinger best because the holster is kydex and therefore it does not rely on body pressure to maintain retention of the firearm. Its also cooler because you do not have a large piece of material (leather, neoprene, etc.) touching your body which is especially important to me because I live in Florida where it is hot 11 1/2 months out of the year. The holster is also very comfortable to where and does a good job in minimizing printing, even with my double stack HK VP9SK.
I am a Holsterholic so I've tried a lot of different holsters, those are a couple that I have had very positive experiences with, YMMV. Thanks for the video link Vandal320. I will have to see if one of my single stacks will coincide with my Tactical Muffin along the 300th Parallel.....