Most of the dashcams from the market are offering only Time-lapse mode for parking mode. If they are offering such option! So maybe it is better to use this mode also with your camera. 5FPS is the most used.
There are no problems with the Viofo parking mode, just some users are considering the Auto event detection is detecting too many motions or two less motions. You cannot satisfy them all so because of this Viofo is offering Time-lapse or Low bitrate mode. Of course also these modes will not satisfy everybody from the planet, some will complain the Time-lapse does not have sound or others will compain the Low bitrate is using too much space on the card.
For the best parking mode option Viofo should include an well trained small guy inside camera and he to manually start recording when see something bad around car.