OK. So here is my attempt to create a detachable front license plate. It is a combination of super magnets, gorilla glue, gorilla tape and zip ties.
Supplies
1. Super magnets (neodymium)
a) two (2) 18 mm x 3 mm discs
b) two (2) 12 mm x 3 mm discs
c) two (2) magnet discs with caribiner hook
2. Gorilla glue (the one that takes 1-2 hours to set and requires clamping.
3. Gorilla tape
4. 2 heavy duty Zip ties
5. Rubber weather seal with adhesive backing.
Magnet Orientation: Determine the orientation of the magnets so that they attract and not repel each other (super important!!!!!). The idea is that the 12 mm x 3 mm discs go on the front of the license plate backing (where your license plate will be mounted), the 18 mm x 3 mm go on the opposite side (facing car) and the caribiner magnets will be attached to the grill using zip ties. OH. The caribiner magnets have tape covering them. Very important not to remove this. I removed them, and then tired to figure out magnet orientation, but the 18 mm magnet got stuck. The magnet on the caribiner is recessed by 1 mm, so you can’t slide any magnet inadvertently attached off (thus the gorilla tape). Required a blade to remove the magnet.
Assembly: Clean surfaces of magnets, and the left and right holes of the license plate backing. Wet all surfaces that will be covered in gorilla glue (magnets, license plate backing. Moisture is required to activate the gorilla glue). Starting with the 18 mm disc, spread glue around the outer edge and attach to license plate backing. Similarly do the same to the 12 mm disc on the front side of plate. I put some in the hole as well so that there is glue attaching both magnets. The 2 magnets essentially will create their own clamp to help the glue bond them together (with plate holder between them). Cover the 18 mm magnets with gorilla tape in an X fashion. This is done so that you don’t have magnet on magnet touching, because it is super difficult to separate the caribiner magnet. Tape on strips of the rubber seal to areas of the plate that will touch the car, to prevent scraping.
Disassembly: pull each caribiner off from the license plate by sliding them off. The caribiners can then be detached from the zip ties. The zip ties will remain on the car’s grill, while the rest can go into the frunk.
I hope that made sense.