So I don't have the slime charmer ring

but I was wondering if I could get it with an Item code.
And yeah also I'm new to slime houses. (Im calling it that because my autocorrect thinks it's hitches.)
Please post a photo of your layout and tips are welcome too. Don't forget to vote in the poll.
Well, like many things in Stardew Valley, the answer will depend on what you intend to do with those slimes.
In all cases, I advice against letting slimes roam freely, unless this is precisely what you want. Couple of reasons while slimes should be fenced:
- Slime charmer ring or not, slimes will still try to attack you and 20 slimes in an area like the hutch will swarm you and greatly impair your movements in a most annoying way
- If you decorated the hutch or placed machines in it, attacking slimes will keep on removing items that are in their path to try to reach you (does not apply to fences though)
- Without Slime charmer ring, you will suffer damage and you health can drop quickly with red, purple or tiger slimes
- With auto-attack on, you may accidentaly kill slimes and even many of them
Regarding hutches layout, it depends on what you want to do with the slimes.
If your goal is only to get slimes eggs, a layout like the one on the wiki is a good option: you can incubate eggs safely, you never come in contact with slimes and they are contained in the smallest area required.
If like me, you want the slimes to live their happy slime lives in the hutch, you need to give them more space, while finding a way to limit the issues that I mentioned above
In this hutch (I have currently 4 of them in this save file), I use fences to delimit a free area for the slimes and all of it has flooring. This means that slime balls will always spawn out of the fenced area. I use two entrances to access the slimes area: I enter from one side (usually the right one), this attracts most of the slimes there, I do what I have to do (incubate egg, decorate, kill some slimes on purpose...) and I leave by the other exit, while most of the slimes are still occupied behind. The sas on the left side is usually in case one slime managed to follow me.