I counted ten hens. Is that right? You only need one nest for every four hens if the nests are about 12” x 12”, one for five hens if the nests are a little larger, say 16”. For ten hens, I’d suggest three nests but you don’t need more unless you add more hens.
Henless gave pretty good advice. I don’t know what your roosts look like but they need to be higher than anything else you don’t want them sleeping on or in, like the nests because no one enjoys poopy eggs. The best materials to use are generally tree branches or 2x4’s with either the narrow or wide side up. For winter I suggest wood. It’s better for their feet than metal or many other materials since it does not transmit heat very well. Wood will keep their feet warmer than metal when it is really cold. In the summer that doesn’t matter.
You have to be careful with them sleeping on wire too. Your metal shelves are fine, especially if they are plastic covered, but when wire is made it sometimes has sharp jags of metal or galvanizing that can hurt their feet. You need to check the wire to make sure the side they are sleeping in is smooth. I’m just mentioning that for other people’s benefit. Your shelves are fine. Lots of chickens are raised on wire.
Since yours are in the habit of sleeping on that shelf, they may not want to immediately switch to the new higher roosts and may sleep in your nests. Chickens are creatures of habit and can be pretty stubborn sometimes. After they are settled in for the night and it is pretty dark, you may need to move them to the new roosts. It needs to be dark so they can’t see that well to go back to the shelf. Taking that top shelf down completely would be a good idea while they make that transition to the roosts.
I would open the nests a couple of days after they are used to sleeping on the roosts if none are laying yet. If that older hen is laying she really needs a nest to lay in. In any case you want the nests open when they start to lay. A pullet just starting to lay may accidentally drop her first few eggs about anywhere, but as soon as she gains control of that process, where she lays her first controlled egg is where she wants to make her nest. Many pullets get that right to start with and control the first egg. As I said they are creatures of habit. If they get in the habit of laying somewhere other than your nests they can be pretty stubborn about switching.
Good luck. You should have fun with those. Looks like you even have a naked neck (Turken).