I have played many Cowbell mounts for the bass drum, and while others have given me issues with either sliding from the bass drum, or not allowing enough mobility for where I want my cowbell to go, this solves those issues for me.
Firstly, you can put the mount off to the side of your bass drum, and then adjust the L mount straight, so it will never be slanted when mounted off to the side.
It also has enough room to fit your main cowbell and maybe a small Cha Cha bell or jam bell.
Quality build, complete with a rubber grip that won't stain or mark the hoop of your bass drum.
It also has an unbranded look, so if you are an endorsee of a different company, there should be no problem using this product.
For me, the best cowbell bass drum mount on the market, especially with its position.
Solid and stable cowbell holder. Used it for a bunch of gigs and transported around a lot. Still in the perfect condition, sitting tight on my bass drum hoop. Totally recommend. I am not sure if it is appropriate for every cowbell size, though it should be possible to adjust it. So just for the reference: I am using it together with "LP 205SWN Santana Cowbell".