My neighbor has a 2006 PT Cruiser, and with the older models it was a complete non-starter as a harp car. It was way, way too short and the seats didn’t fold in a harp-friendly way.
The current version looks like you could maybe base load it by folding down the front passenger’s seat, which I guess might be okay if you don’t move the harp much and are strong or have help available.
I would point out, though, that it still has pretty poor gas mileage for a car its size (24 highway for the 2010). If you’re willing to go to that much trouble to get a harp in a car you can do substantially better on mileage with other cars, or find more pedal-harp friendly vehicles with similar mileage.