You say your wife vetoed the idea of hanging them on the wall. I bet she did that, not for any good reason, but because she doesn't want a change in her environment. Some people are like cats in that way. (have you ever noticed that a cat hates it when people re-arrange the furniture.

Now providing these things:

1. that the wall you want to use is an inside wall,
2. that it doesn't have a heat register on it blasting dry air
3. that direct sun won't be shining on your guitars

Do this:

tell you wife you are getting the shakes from guitar withdrawal, and hang one guitar on the wall. Then gradually keep adding guitars, closely observing her reactions.

I bet in time you will have all five of them up there, beautiful objects ready to be played.

You might consider adding other, smaller objects d'art among them. That I leave to you.