@dzungpham0703
I buy them on Aliexpress:
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20180706102504&SearchText=HTTM
If you apply hot air it is easy to take off the white "double sided tape" and the plastic.
@Shivanand-Chanderbally I recently finished a node using the acs712 and found it to be very sensitive to nearby magnetic fields. It is best to have it as far away from these as you can.
Oh, I never even thought of that as a possibility.
I really like KiCad, and it's my preference. For a while I had Eagle for work, but even then I still preferred KiCad whenever I was given a choice.