Flying a TV overhead

I donated a couple of 65" TVs to the American Legion, where I'm doing weekly karaoke shows. These will be upgrades to the current, smaller TVs. The one that faces the stage (for the singers) is hanging over peoples' heads. It has a couple of steel pipes, which are bolted into the steel roof truss and then has the mount plate bolted into those steel pipes. It's good and sturdy and the new, larger TVs don't weigh much at all. The part that makes me nervous is not having a safety chain(s)/strap(s) connected to the TVs, in case the bracket comes loose. The mounting plate has 4 screws going into the back of the TV and I don't see any additional places to attach a safety chain/strap. Wondering if I'm being too paranoid or perhaps one of you guys have an idea on how to add a safety chain/strap? I was going to pawn this job off on the Legion but they're asking for my help. I'm meeting one of the members there at 5p, to try and do this change out before the 7p show.

Proformance said:

A safety cable isn't typically used for a fixed installation. You already have multiple bolts at each mechanical point,

What you do need is a secured locking mechanism on the bracket holding the actual TV. If the bracket is a type with just twin blades that drop onto the edge rails of the wall/hanger plate - then there must be a mechanical lock of some type that absolutely prevents the TV from being lifted free.

Personally, I'd want the bottom to be at least 9Ft off the floor, meaning a person 6'10'' tall would need to jump at least 2 feet high to hit their head on it.

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It does have a locking mechanism. The bottom of the bigger unit will still be roughly 9' off the floor.