As a preventative measure, I have installed
Das Schild Interior Liners .
These attach easily and provide real protection against the dents you speak of from 'overfilling' the Trunk or Frunk.
You still cannot force them closed, but, you will feel the resistance well before causing any damage to the body panels thanks to these liners.
Keep an eye on them as they frequently have discounts and sales. I got the set - Trunk/Frunk for $150 shipped which is much cheaper than repeated PDR.
Cheers!