Looking for a shotgun wall mount.

[Super Trucker]

I would like to mount the HD Shottie behind the curtains next to the bed for easy access, yet not in plain sight. I would like it to be vertical, similar to the Mossberg mount (which I saw using the search feature), but not having the action open. and a lock is not that important. The 870 this is for has an 18" barrel with the mag tube extension, if that helps. Thanks