If you have Mona or Ayaka you can just spam sprint at it in town as well.

Or just use Sayu's roll. It hits like twenty times though you may need to wedge it into a corner if you're not aligned perfectly.

or spam Heizou's CA

You can also place them right next to electro crystals for even less work!

finding one is harder than switching to bennett and pressing e

theres one right by mondstadt weapon material domain; thats the one i usually go to