I’d say TomTom is the best addon for this.
You can enable a little coordinate bar in TomTom’s settings and put it anywhere on the screen you like. Looks like this: https://lh3.googleusercontent.com/lDPMsaKfgUbKYnpCFBC0r6N28YIar4ETyEza7laAa6SKMjWAOwKfITP192DzLrhDI6fJ=s102
It also allows you to navigate to a point with /way [x] [y]or /way [zone] [x] [y] if you ever need to get to specific coordinate listed somewhere.
The addon is pretty minimalistic, it doesn’t alter your existing UI and only adds that coordinate display and an arrow when navigating to a waypoint, both of which can be easily removed from the screen.