Default Help installing TWRP 2.7 on new G2 with 12B

I have downloaded a TWRP 2.7 flashable zip. The official instructions on the TWRP site talk about using a .img file, but they don't have a 2.7 img for vs980.

Many threads mention some images are Lokified, others are not, I'm not sure how to install.

This is a new G2 with 12B that I'm going to root with IORoot 25, how can I get TWRP installed on it as well, preferably in same adb session?