I designated an entry area to the mob trap just E of the future CommEx, and that area is right next to the river, so a tower trap may work there. I watched the video and wasn't super impressed at the drop frequency, but it's worth a test. Why not?
The underground trap idea was to stretch underneath the CommEx (since there's no basement), but if we go above ground I'd still like the mob-cube-head from TN to live above the space I've marked. We could even do a path from the top floor of the CommEx to the top of the head to get to the sky trap if it works.
So it goes.