Injections in quad

I was wondering if anybody could give me a description of where to inject in the quad. I’ve only injected in the glute before and don’t know where to inject in the quad. I couldn’t find anything in the search.

Take your hand and find your hip bone. Place your thumb on your hip bone and open your hand on the outside of your thigh. Where your little finger ends up is the beginning of the area to inject. Now place your little finger on the outside of your knee joint, stretch your open hand and where your thumb ends is the end of the area to inject. Only inject on the side, never in the front or inside of the thigh, as this area contains more nerves.

I was told go 2/3 of the way up your leg (starting at your knee) and on the out side. Also don’t use 1.5 in, unless you have huge quads.