There are two models here, Pointy painters pyramids and some blunt ones. For most cases I recommend the blunt ones so they don't mar the surface of your object. However if you need to stop the item from sliding then go pointy.
See the video here https://www.youtube.com/watch?v=h6yy7ZnaaLY&t=180s
Painters_Piramid_Blunt_tip.stl | 104.3KB | |
Painters_Piramid_v1.stl | 104.2KB |