I honestly don't know the answer to that question. But if it was me I wouldn't mount the esc that way. Instead I'd mount it diagonally across the rear shelf with the motor wires towards the shock tower. Have the motor wires make a u turn along the right side of the esc, secure them to your esc shelf if need be. Offset the cap pack just a tad so the battery wires head straight to the front towards the battery leads. The esc isn't square to the chassis and not quite as pretty but more protected and functional.

Also that Lexan looks pretty thin in your other thread. It's not soda bottle or rc body thin is it? If so it's going to flex too much, rattling the esc more than a more solid mount. Also Lexan that thin tends to tear. I'd recommend getting some 1/8 thick Lexan sheet, under $20 at Home Depot for sheet that's about 10x18. With that thickness you might not need to support the overhang at all.