We have had all plastic ones before and didn't have a problem. You could easily put a washcloth underneath. But.....my best advice would be to wrap anything or any metal part with duct tape. Then it can't scratch anything and you can use it as you want, and it won't raise it as much as a washcloth.
I agree with Corinna that there is ample space, but I did enjoy our organizer too. It made it a little easier, although not completely necessary. I think the times it was the most used was when we had 5 people in a cabin. Extra bodies means extra mess. So, it totally depends on how many people you are dealing with. IMHO....3 people it's not needed. 4 or more, it definitely helps.
It's true that duct tape can solve almost any problem

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Also, one of my favorite tips is a bungee cord to keep the doors open when you have a connecting room. It's nice to have those doors stay open when you want them too.