To add to this: Are there any compatible mods that really add to the experience using this one?

There is a submod that adds bigger maps, if you search ST in the steam workshop you might find others. As for compatible mods, I've only managed to get dark skies to work.

Also tiny outliner as well works, even with one of the UI mods.

I wouldn't suggest using the mod which adds bigger map sizes. Unless you got like an I9 9900K and 16gb's of ram. This mod as it is has worse performance than the vanila game and adding more stars wil only make this worse.

But do what you want ofcourse, but don't expect to have a quick game when you run it at 20 fps

Re the above discussion. As someone who uses an I9 i've run heavily modded 3,000 star maps with 100 AI fine before. 2,500 used to be the sweet spot. I will need to test again to find the sweet spot but its perfectly doable depending on your specs.

The Belt and Living System mods works with ST New Horizons