Build 1 Foundation, (Adobe,Stone, or Metal) four walls on the first level, three on the second leaving one open, attach a ramp to the open section, if you can successfully drop the mantis in, it will remain still for the duration, and no repellant or broth required.
Best method I was told. Build a 2x2 stone [or wood if low] foundation with 2 high walls, drop in with flyer, feed through wall. Has a massive hitbox to feed it through if lured close to a wall. No repel needed with this method.