I installed ultrasonic sensors on my leased Clarity EV without making any modifications to the car. I use it every time I park in front of my garage to get the nose of the car close enough to the garage door so that the tail of the car is not sticking out in the sidewalk.
Parking Sensor kit- Ebay, about $11 shipped from China. got one with audio only (no LED indicator) - don't need the display
Made 3D printed brackets out of PETG (ABS or nylon would be good too). Painted black since I only had gray filament.
Cut plastic license frame with a dremel/ Used 3M VHB tape to attach sensor brackets to frame
Extended the power and piezo buzzer leads with ribbon cable.
Ran 12V power to inside car.
Getting 12V power from my dashcam power adapter (open up adapter- solder to appropriate +/- points).
Wired up a switch for the 12V power so I can turn it on while parking
Buzzer removed from bulky housing and hangs loose by power adapter/switch. Cover buzzer with tape to make it less loud. I think I also added a resistor in-line for the same reason
Jammed control box into a space under hood where I think it will stay dry.
Some pics:
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