I typically use a staple gun to secure everything on the target backing, post its or not.
And I do typically shoot up alot of them. Sometimes when we have access to autos, we will cover a silhouette's entire vital areas with post its and tear through them. Putting a red one for the heart, green for intestines, etc...makes for some good shot placement drills.
And the drop holster...I like it because all my pistols fit into it, so I dont have to change holsters when changing guns. And it is extremely easy to draw from. That, and when running tactical drills at the training academy, it is a good all-around holster. Of course, still do plenty of shooting from my CCW rig, but for training and teaching, I like to have my pistol more accessable.