Well, we will likely be a a stepping stone from 1272 on the open. Standing orders are difficult to do in options with giant bid ask spreads (ITM SPX options are notorious for this). If you have a broker that will work an order in the SPX options pit, that is best. Otherwise, some sort of automated system that give up .05 or .10 beyond the mid will get you filled much of the time.
Probably the best way is to use SPY options. Those are extremely liquid and have a tighter B/A spread by comparison, although no one may fill you. They are not as efficient as SPX options (in terms of size of contract per commission), but most people on this site are retail traders anyway. You have to work hard to get a ITM option fill at a decent price, even giving up edge.
There is no choice at 1272. We must go long, and go long with courage using 50 or 75 or higher delta call options, unhedged. If you prefer, as I have suggested above on several occasions, go long on a cross from below 1272, that way momentum is on your side. The risk is that you miss the entry completely trying to save a couple of handles (silly when your target is 100+). Another thing to do is to let go the hedge from previous long call trade at 1272 ish, but that may not give you enough deltas.
If things go bad, the hedge point is again about 8 points, or 1262-1264 where we have to hedge the long calls once again. Then we wait for 1242-1250, but first things first.
Note that I don't recommend trading the ES this way unless you are extremely disciplined. The reason to use long (ITM) options is that they have a built in catastrophe regulator, you can't lose more then the premium you paid when you are wrong, and they act like the underlying when you are right. So you control your emotions when things go bad and go good. Perfect.
At the risk of repeating myself, we trade against the momentum (but note not against the trend) because SPX is massively undervalued here relative to "FV". Parameter mildly inverted still. Not perfect, but then we probably wouldn't be close to 1272 if it weren't.