Good airflow ?

I don't fully understand the question...

Are you asking if you have enough fans or if they're placed properly?

For the most part the fans that come with everything are placed correctly and don't need to be modified in any way.

I want to ask are they placed properly   ?

If you didn't move them then they almost certainly are.

Really the simplest way to tell if your case has got adequate cooling would be to run something intensive like a game or stress test and monitor the temperatures with a program.

If you're not over 80C anywhere then you're fine.