I’m also new to Tesla and have a similar question, when leaving your car at a body shop where they instal paint protection film and need access to the Frunk , how do you secure or Valet mode your car ?
You dont, really. If you dont trust the shop with your car, you likely need to choose another shop. For any decent shop, a model 3 is pretty low on the list of cars they work on, so wouldnt be that interesting to them to drive or anything.