I've never checked into E-minis before. I just had a position filled on TOS paperMoney and went in to enter a trailstop and that choice is not listed. The only thing there is limit order (not even market order). I feebly tried the search function but didn't see anything meaningful right away. I'll be the first to admit my search skills are lacking.
I don't trade emini options (prefer spy) but in general it's dangerous to put in physical stops for options b/c of the intraday vol. If that's your cup of tea just call/email the trade desk - it's the quickest way to get the right answer.
CME doesn't support stops on options. You'll need front end that supports these off the exchange. You don't want to give a stop order to a broker or market maker either. You'll get run over. Look at TT...they began offering a series of sythetic stop orders last year.