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In the middle. I have a seat belt clip adjuster thing in my car. It really helps because I can adjust depending on what bra I'm wearing (sports or regular) and it helps because I'm pretty short.
these ones look the most similar to what I have, but I’m sure there are plenty others that would get the job done. Try searching “seatbelt clips for adults” and see what you can find, I can’t stress enough how much more comfortable it is when the seatbelt goes over your chest and shoulder properly instead of the front of your neck
Not the person you replied to, but I use a product like this too. If you search "seat belt adjuster" on Amazon, there's a couple different styles but this is the one I use.
They make seat belt adjuster clips, you can find them on Amazon. This is the one I use. I have a similar sized chest and finding this was a total game changer for me.