The first thought in my mind when you said "display in a store".... is to put the knives in some type of case.... that can be/is locked. I've had a lot of experience with this type of situation, and have had a number of knives stolen over the years when displayed in any way, that anyone other then the proprietor(s) could get at the knives. This not only protects your knives from being stolen, but it also provides a level of protection against accidents by people who really shouldn't be handling a knife anyway.
At MINIMUM, something like this:
https://www.amazon.com/Jewelry-Stor...ords=knife+display+case&qid=1615041120&sr=8-5
Preferably something like this:
https://www.amazon.com/Elegant-Alum...rds=knife+display+case&qid=1615041120&sr=8-20
The words I would use to describe displaying knives for sale would be .... Clean & Professionally displayed. Anything that draws attention away from the knife/knives (meaning any props/other items) is simply counterproductive to what you're trying to do..... which is sell the knives.