Your choice depends on your needs.
A 1080P interior rear camera handles basic recording. It mounts easily on the rear windshield.

A 4K rear camera like the F77 model delivers sharper footage. It performs well for capturing moving details like license plates, even at night.

You can mount the rear camera outside above the license plate. This external placement avoids windshield interference. It maximises the recording angle and improves clarity.

External rear camera installation can be more involved. Professional help may be needed.

Always verify the camera's waterproof rating. Non-waterproof models may suffer water damage if mounted outside.