I think, it'll be look great with Mushroom Cloud effects (mod - https://mods.factorio.com/mod/MushroomCloud) At this moment, it's not compateble, MIRV stok animation disable MusroomCloud animation on MIRV bang. For exemple, Orbital ion canon work with MusroomCloud.

I find hand made fiks at Mushroom Cloud forum. You can added in ...\Factorio\mods\MushroomCloud_1.0.14.zip\MushroomCloud_1.0.14\prototypes\ground_zero.lua
string:
data.raw["artillery-projectile"]["mirv-projectile"]
in blok
"local projectiles =
{
"
Dont forget add "," in last string, befor aded your string.
But it doesn't disable stok MIRV effect, this work together with Mushroom Cloud.

that worked thanks ! its ever more awesome with it !