KOT - I'll be installing the TV and know the location of the conduit, but might still be a good idea to get some metal strapping installed vertically for protection. This wall is supposed to get a 2" acoustic treatment and that's a 2x6 wall so there will be some separation.

ERNIE - I've found that MuMetal works best close to the source so I steal of a sheet behind the TV is probably olace it around the panel and around the conduit. By doing this, I won't need to worry about penetrations behind the TV.

A recessed wall box still needs to be placed behind the TV for power, low voltage and conduit up to the attic.