I can't undo the mining drills if I place them using your mods. I'm using the redo mod, I don't know if that's the cause.

It's a Factorio limitation. Mods can't modify what placed things can be undone with Ctrl+Z. They have to handle it manually. I don't see Redo adding any integration I could use.

That said, I'll add an undo button in the GUI for the next update.

I love this mod so much but this is the most frustrating part of using it.
With the 2.0 changes to undo / redo is it any different now, is this a feature you could support with Ctrl+Z?

The 2.0 API still has limitations (you have to undo multiple times) but it does work with vanilla Ctrl+Z