the build freedom plugin is kind of needed for placement.

otherwise (in creative) paste the turret on air, ctrl-shift-b to blueprint the subgrid only,
(in survival or creative, wherever u want to use turret) attach small grid 1x1x1 hinge head, 1x1x1 conveyor junction on top of it, then projector behind it. then load aforementioned bp into projector and build

How to place it on grids? I cant put this on my ships. just on the air

as of recently you can no longer connect small grid hinge or rotor parts to their large grid counterparts unfortunately.

uhhh what specifically is the issue

This BP is broken and will not build in survival with a projector.

I've just worked out why it won't paste in; the rotor is off by 2° compared to the rest of the grid. That's why it won't stick.

Is anyone else having trouble getting this thing to stick to grids? Cant use a projector because the rotor is about 20mm too low plus I'm getting a weird "projector doesn't allow building" error on my UI. Pasting it in isn't working for me either because it won't stick to any existing grid. Help?

good ;D

Quality turret!