Throw some "Danger: High Voltage" stickers on that and your good to go! We don't have any kids, so I have way too many loaded firearms around. But the coated hooks above the closet work well for me too. unfortunately, I've run out of closets!I would suggest this:
Homack In-The-Wall long gun safe
It is only 17" wide and fits as flush as can be. You could install this and hide it behind a bookcase, or put it in your closet and use a trench coat or two to hide it. There is no good way to hide anything for the most part. If they start tearing stuff up (drawers pulled out, etc.., it might be found). Using this safe would give you some additional theft protection, but if they think you are gone for hours, they will eventually gain entry to the safe as well.
Mine stands beside the headboard barrel down next to the nitestand with my Glock on it. Glock goes with me when I leave. Don't need to hide it. My wife knows where it is and the dogs can't get to it.
Now I like that High Voltage sticker idea. That does kinda look like an electrical panel cover. Where can you get the decals?