I keep an unloaded shotgun under the bed behind a row of shoes. The shells are in the top drawer of a very high chest of drawers. It would take a little time to get the shotgun out and load it, but I don't have to worry about my curious grandchildren getting the shotgun and loading it.
Its your house, and your business, and I'm glad you don't worry. But I've got to tell you that, no matter how well behaved they might be when someone is watching, if little house apes have unsupervised access to an area, they WILL find everything you think you have hidden, unless it is behind a locked barrier!
I never saw any point to hiding, or putting a trigger lock on an unloaded gun. Unloaded guns are simply NOT dangerous. And, putting a trigger lock on a loaded gun is the act of a FOOL!!!
IF you have concerns about children (or anyone) getting their hands on a loaded shotgun, simply don't store the gun loaded when you aren't there. You have a handgun(s), for defense, so there's no need for a shotgun to be instantly "ready" 24/7.
Keep the ammo in a locked container, and you don't need to hassle, or worry about a lock on the gun. If the shotgun is to be your "grab in the middle of the night" gun, store it unloaded during the day, and make loading it (or just loading the magazine) part of your nightly lockup ritual. Lock doors, turn off lights, put out the sabertooth cat, load shotgun, put it in an accessible place, and go to bed. UNLOAD and CLEAR the gun in the morning, before leaving it unattended, returning the ammo to secure storage.
It may seem like extra work, but if you don't have a secure storage for a loaded gun (such as a safe) store the gun unloaded!! Secure (lockbox, etc) storage for ammo is easier to do, and solves all safety concerns, quite handily.
People have become fixated on the mantra that in order to be safe, guns have to be locked up. While it does work, it's not the only way things can be safely done.