Check out the “Let it Snow” Xmas 2020 Group youtube project!”
I think finding the right shoulder rest/chin rest combo can take some time. Also, I think this set-up can change, particularly for adults. I think young children starting out kind of shape themselves to their instruments.
I initially started with a Wolf Secondo & a Guarneri chin rest. I injured my left shoulder (fell off a ladder), & exacerbated it by how I was holding the violin. As a beginner, arm positioning can feel awkward. It is important to not tense up. And if what you’re doing is causing pain, stop.
After 3 months of physical therapy, I changed to a center chin rest (Flesch with hump), with a Comford shoulder cradle, and was comfortable with them for a couple of years.
Then after a while, these didn’t feel as comfortable (seems to coincide with when I was doing more shifting), and I tried a few different combinations again. I ended up with (& use now) a Bon Musica shoulder rest with a Wave I 1” chinrest. The Wave is like a compromise between a center & side mount chin rest. Don’t be afraid to improvise. A woman who played viola in the ensemble group I used to play with used a piece of cardboard wrapped with shelving paper in lieu of a shoulder rest—it worked well for her. I use a piece of cosmetic sponge on my Bon Musica so that it doesn’t dig into my chest. Working well (for now).