Audio-Technica Pro 45 Cardioid Condenser Hanging Microphone (Black)

To hang the Audio-Technica Pro 45W Cardioid Condenser Hanging Microphone from an I-beam, you will use the included adjustable steel-wire hanger in combination with a standard industrial beam clip, preferably one that has 1/4"-20 or 3/8"-16 mounting threads, to create an anchor point, without the need for drilling or welding. Tighten the clamp around the flange of the beam, then loop or zip-tie the cable around the clamp, or attach an eyebolt to a mounting thread on the clamp and thread the mic's cable through. The steel-wire hanger will attach to the mic's cable and it can be adjusted in order to aim the mic at the proper angle to pick up the audio from the sound source.

The Audio-Technica Pro 45W Cardioid Condenser Hanging Microphone (White) has included cabling that hangs freely. It connects to an XLR ceiling plate.

Yes, the cable is fixed in the own mic.

According to the spec sheet the the mics have a 120 degree pickup and should be placed 3x the distance from the mic to the closest source across the front of the stage and 2x the same distance from front to back. So if the Mic is 4 feet above the closest performers head, they should be 12 foot apart across the front of the stage and 8 foot spacing from the front to the rear. By going higher you can increase the distance apart but these mics are prone to feedback so closer will work better and give youe more gain before feedback.

No, I have not found one yet.

It worked well for an amateur stage production for 100 people. It's made for the purpose that you suggest.