Is there a chance for me to get scammed there?
Yes. I will assume that you are considering to have ~$55k worth of bitcoin sent to a 2-of-3 multisig address in which each of you and your trading partner will each hold one of the keys required to spend funds from such address and btc-asia.com will hold the 3rd key. The person/entity behind btc-asia.com could potentially collaborate with your trading partner to steal the BTC contained in the multi-sig address, with each of them receiving a portion of the BTC, or the person/entity behind btc-asia.com could be the same person you are trading with and they could decide to steal the BTC in the multisig address.
You will need to trust the escrow facilitating the transaction with the entire amount being held in escrow, regardless of if multi-sig is being used or not. If you would not trust the owner of btc-asia.com with $55k worth of bitcoin then you should not trust them to escrow a deal for you.
