I have 75 inch TV mounted on wall with metal studs, my solution was to install 2 boards ( 1 by 5 inch) across 3 or 4 studs (been a while) then install the mount on the boards, did the same for a neighbor with a heavy 80 inch TV. This approach seems to work very well and I made sure the boards were short enough too be reasonably well hidden by the TV.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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