They will not consider that a tow point.
You can do something like this in the back, if you have a trailer hitch receiver.
Up front you need properly mounted D-Rings or hooks.
Doesn't matter if the bumper will work: you're going to get someone who's a stickler for the details, and they wont' let you run.
(it's the same in all amateur motor sports. Try the parking lot races for old sports cars where they argue about battery tie-downs).