The only bookmaker in Macau both online and in the casinos is
https://www.macau-slot.com
They only offer Football (soccer) and Basketball. Maximums online for a single bet which may be repeated unlimited, though prices may change, are HK$10,000 (US$1287).
Before 2010 they did proper bookmaking and would not look at others. These days they are copy cats and you will almost always find a better price elsewhere. The good news though is that they are 100% safe.