I looked quickly through the handbook, and I thought I saw that rule but I wasn't sure. So I've been looking through the Robot rules to find it. And now I know! It's under the game rules!
Okay, so flop-bots are legal? I bet HOT is happy
Also, what are we supposed to do about bumpers and flags should we decide to use a flop-bot? Does the flag start horizontal? And are flop-bots allowed to have bumpers?