Is there a problem with a media enclosure box in a laundry room?
A standard laundry room inside a home is normally classified as a dry location. Sheetrock on the walls? This is a clue it is dry as defined by code.  There can be a washer or a basin directly adjacent to a breaker box. An outlet would need to be GFCI protected.
Other than a clothes closet and a bathroom your panel can go just about anyplace that has a 30” wide space floor to ceiling. Although you are asking about your media box it has less restrictions. Receptacles in a garage now require GFCI protection if you have line powered devices. If the house is older it may not have GFCI protection.