If you don't care about feng shui, you can put it in any way, as long as it doesn't occupy public space and affect others. It's just that the exhaust gas will go home. It is not conducive to family hygiene and health.
This thing is not mandatory. Stop if you want. Head towards the exit, mainly for convenient cars. The front of the car is inward, which is convenient for parking. The front of the car is outward, which is convenient to get out. It's up to you.