There's a reason 3M calls it VHB tape, as it means Very High Bond. Same for Dual Lock. It's not exactly easy to remove the stuff.
For any high strength adhesive dash cam mount (3M VHB) or Dual Lock tape, the best method I've found is to use a thin putty knife. Starting at a corner of the tape work the knife back and forth laterally while applying increasing pressure forward until you begin to work the tool under the tape. Once you get the knife part of the way under the tape (or VHB taped dash cam mounting plate) begin gently twisting the putty knife back and forth, side to side to begin prying it off the glass. Continue this process until you've inserted the knife about half way under the tape or taped object you want to remove and it should then come off completely (but slowly) when you pull it with your other hand. Continue pushing the putty knife forward under the mount as you do so. Also, once you've gotten the putty knife far enough under the tape you can use it as a lever prying upwards, away from the glass. After removing the tape, clean the glass with some alcohol and a clean lint free cloth. I have found this method to be far superior and significantly faster than using string and using a tool with a handle and stiff but flexible blade gives you far more strength and control than a piece of string.
I've been using this method on countless occasions for years using a standard (thin) metal putty knife and have never scratched or damaged the windshield glass. Just be careful and use common sense. If you are paranoid about using a metal knife you can use a plastic putty knife. I've experimented with one I purchased at Walmart for about a dollar. Plastic putty knives can be found at any local hardware store at modest cost. They are also widely available on Amazon.
https://www.amazon.com/s?k=plastic+putty+knife&link_code=qs&sourceid=Mozilla-search&tag=mozilla-20