This mod looks dropped (no updates 2 last years), maybe I'll implement it in the fork, anyway ideas:
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Cooperate with cheap ammo mod: https://mods.factorio.com/mod/jatmn_stone_ammo
to provide stone loaded turrets - that will be the same entity (turret), but with different ammo. Small turrets, even with upgrades, are too weak vs Big enemies from the Rampant mod and etc., but it is ok with stone ammo with the kickback effect.
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Make cluster turrets recipe: 5 or 10 turrets, that will be randomly placed around the target throwing position — good for raids.
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If portable turrets are not placeable with bots, they should NOT leave ghosts! It looks like a bug!