I have just taken a look at this site:
I am not advocating their service even if it seems to come from a country with a strict rule of law.
Adopting from a surrogate mother is big business. You may read their disclaimer which sweeps very large.
To avoid deception and grief, I strongly suggest, before you spend a single dollar, ask for legal documents which you will be required to sign and consult your lawyer.
Remember that if you wish to adopt out of your country, even from a surrogate mother, you will be subjected to your own country's immigration law as well as the country's law where the child will be conceived.
I wish you my very best