Too high...I like to float my thumb.
+1 to the floating thumb technique. Then you don't have worry about what's where and how/where you're going to anchor.
When I started playing again a few years back, I concentrated on not anchoring and floating instead... one of the best things I probably did. My playing is much cleaner. Turned out, it wasn't as difficult and didn't take nearly as long to switch as I thought it woul.
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