Hi
Personally, I use this plugin in RPG Maker MV version and it's called
Foreground plugin
Author :Sasuke KANNAZUKI (thanks to Yoji Ojima) .
It is free on the Internet.Personally, I don't know if they also have an MZ version. You'll have to look into it.
I was also recently looking into what I could replace this plugin with in the MZ version to see if there was something better, but everything that is great is only paid.
PS:
Parallaxes - It is a partially transparent infinite texture in PNG format adapted for RPG Maker MV/MZ 816x816. It should work in any foreground plugin.
But in RPG Maker you can make the parallax in the background what will be like behind the entire tilesets and then the foreground parallax but you need a plugin for that and that's what I wrote. And you can also make a combination where you save two parallax in a png and use it like that. It is not guaranteed that such a combination can look good, it depends on the circumstances.