This cowbell holder is really handy and I use it for both a cowbell and a Latin block, I have a second one the I also use on a washboard! The problem is because the thread is at an angle to the surface of the hoop there is no way for it to be tight enough to stay put without digging IN to the hoop, or staying slightly looser so you have some movement, but that can cause scratches. I have a sh*tty old hoop that I can use but if you're looking for something to put on your "life partner" kit look elsewhere. It will damage it.
I suggest using a dedicated boom arm kitted out for holding those percussion bits and have it dropped over you bass drum.