I have followed the mining trend in India and as far my calculations goes Bitcoin mining is specifically not profitable since post-2017, not sure why you are ordering these miners anyway.

No, I haven't bought any miners from such sites but I hope what you ordered is legit and you get them in working condition.

One suggestion would be to check the "computer hardware" section of this forum where we have many trusted users buying and selling mining and mining related equipment.You just be assured about trusted users there but you should use an lead none the less,
Again I will let you know the better options for such requirements..
Hope for best