For me it works also just fine, of course with CUP Terrain and Units and i use Massi too.
But in Eden + Map X it did not work it all.

Point 1 is reproducible with many Modules, configs, modifications - I mean here other Mods too. Dont know about Alive in Eden. But i can confirm most other "configuration things often not saved properly"
And this is not fixed. Configurations are < 40% not saved and go back to default.

Point to 2 I mean this (point 1 is here also readible)
https://dev.arma3.com/post/spotrep-00053
https://forums.bistudio.com/topic/188371-eden-destroying-headless-client-setup/

I tried it after the hotfix of course, some missions/maps it works some other not.
Same setup but on dedicated server the HC entity spawn in with a Interface/Unit and is frozen.
But this is a strange example. AI switching/overloading to HC was not useable with anykind of script.

Additional you place Objects and in the preview is all fine, on the dedicated server they fly around somewhere in the world. (May more an index problem)
Of course not at all Maps. The same Map build with Zeus/MCC/own compositions all Issues above gone.

For me mean this, at the moment, before I spend hours in a BaseModding or something or i make hundreds of tests in Eden and after that on dedicated server...
I turn back to 2D and other Tools to do the same, similiar on Maps that i want without Issues, like before.

I use CUP at all.
And i want use Eden but in < 50% things going wrong like i try to describe above.
When i use 2D Zeus or something for setup a FOB or something then all this strange things not comes up.