NJBlue, I'd have to partially agree and partially disagree with the responses. Most wall cabinets are 12" deep. In fact, I don't think I've ever seen one deeper (other than base cabinets). Height of the cabinets (which typically are 30" or 42") would be kind of irrelevant as the depth would dictate how much pulling force would be exerted on the anchors. And certainly there are house in TV with 42" cbinets.
So the height shouldn't matter, but the depth would (IMHO).
As for how to anchor, I'd also check with Home Depot and Lowes - they must sell quite a few in TV to folks with metal studs. They should give some ideas too. And be able to tell you what to buy.
One question for you - what were those hanger strips attached to that you saw in the homes being built?
Good luck and keep posting as I am planning the same thing at some point.
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