Wiring for media room

[Speedskater]

If you are going to start that train of thought, then, please allow me to add one more:
d] Earth-ground [and not just 3rd-wire "AC protective"] << How good is it?

• Especially since @DonH56 indicated that the house has been around for a few decades?

No! the connection to Planet Earth has almost nothing to do with day-to-day AC power line quality.

If the electrician and the inspector are OK with the connection to Planet Earth, that's all you need.

Never, ever add an isolated ground rod. All ground rods must be part of the main Earthing system.