Simple Question: Maximum BT Arduinos on a macmini

Hello, What are the maximum number of BT devices that can be connected to one computer? I want to communicate to 10 arduinos BT from maxmsp using one macmini in an installation that must be booted automatically. Can you load as easy the rs232 com ports of the BTs arduinos in max as with the usb arduinos? Does the Arduinos BT need a special “start” every time you boot the computer if you have first set the psw ? are they stable if the distance range is ok?

Many thanks in advance Felix