I know compatibility may be at foot here, but I was trying to run K2, Space EX, and Bob's Logistics (for the better train and roboport variants) and was looking into setting up better grids for my trains (equipment) - is it this mod that makes them available or should they be available just with Bob's Logistics?

Asking because space ex doesn't like this mod for some reason.

Since, in the bob's mods set, that without this mod, there is no vehicle equipment (Well, before Spidertron was added to the game), it is this mod that modifies the equipment to add the grids.
They're also edited in such a way that they're supposed to use the equipment added by that mod.

In theory, you could create a new mod to add grids to vehicles. data-updates.lua is the file that adds them to the vehicles, and prototypes/equipment-grid.lua defines them. You'd need to change the equipment_categories lines to equipment_categories = {"armor"} to use base game normal equipment in them.

I don't know how well you can mod, but, I personally have no interest in doing it.