"racks designed for the guns to be stored upside down like that one won't work if the gun has a scope."
Turn the gun over.
I have some scoped K-frames, the largest is a S&W 17-4 with an 8.375" barrel and a 2x Burris scope. And there's another long barrel too, a S&W 647 .17HMR with a MicroDot on it They've been sitting scope side up for years - February of 2007 to be exact. That's when my father decided to move them to THE HOME on short notice and gave me all his guns. No, we gave some to his brother too. He was 84 and couldn't chase my mother down when she ran - Alzhiemer's.
I have 3, 4, 6 and 7 gun wire racks with multiples of some sizes. The best thing I ever did was buy one extra for the workbench and one extra for the laundry tub (on a board) in the unfinished basement. If I want to spray cleaner or Barricade I let it drain on newspaper over the sink. It also confines most of the stink to the end of the basement near the door.
John