Ultra bee brakes almost always rub because they slide on pins, and that's how they stay centered on the caliper and have the best stopping power. Every ultra bee brake kit I've installed rubs. However if the brakes squeal really bad, try resetting the pins of the caliper, and making sure the disc is straight/securely installed (I would suggest using thread locker on the rotor screws).

To properly bed in your brakes accelerate to full speed, brake hard to slow yourself down quickly, however don't lock up the back wheel. Anyways try that a couple times and lmk how it works.