text: Changed to a bicycle_parking=wall_loops for now.
  
  As for your quest to what an "anchor" might be or look like, see:
  https://www.amazon.de/Wandanker-Fahrrad/s?k=Wandanker+Fahrrad
  https://shop.zweirad-stadler.de/out/pictures/generated/product/4/665_665_90/abus-wa-50-fahrrad-wandanker-2019-69933-d.jpg
  
  These anchors however seem difficult to use with e.g. U-locks, which could be a reason for their practical absence in the real world. If anything, such wall anchors only see use for dog_parking (but dog parking has their own anchor models):
  
  https://www.ozfarmer.com/dog-parking-hook-stainless