FGTech is trustable. One Mikrotik
product (SXT LTE6) from them is on the way. I've purchased from them earlier too. They also helped me to clarify an issue when I purchased a product from another seller. But, FGTech is not the cheapest among the resellers / distributors. I still go with FGTech (even with higher price) for all my purchases, due to trust. The other seller that I dealt with earlier didn't have a clue about certain technical aspects. I had to contact MikroTik directly to clarify an issue. Before MikroTik replied, FGTech responded and clarified.
I used to buy from Multilink. Since Multilink is a major distributor, it doesn't respond to queries by individuals fast enough. They even admitted this on a private conversation. It is okay to buy from Multilink if you don't contact them for any further queries.
Here's the list of all distributors and resellers in India... MikroTik
. You can trust all of them in general, to buy any MikroTik product. However, I can't comment on their customer care as I don't have experience with all of them.
All Chateau products are indoor products. Getting the right external antenna could be a daunting task. One might need to go through multiple trial and error.