Start with the stock move, not the option spread
Before the open, the option spread can be noisy or stale. The stock move is usually the cleaner signal. That is why a scenario estimate can be more helpful than staring at an option quote that has barely updated.
If the stock is up 5% premarket, model that exact move. If it is down $8, model that exact move. Then inspect the estimated option price and use it to frame a limit order range.
Use the estimate as a planning anchor
The estimate is not telling you the only fair price. It is helping you avoid placing an order that is wildly detached from the scenario you are seeing. That is often enough to improve execution quality in a practical way.
This is especially helpful when you want to react before the market opens but still stay systematic.
Where the stock price chart helps
The stock price chart extends that same idea beyond one point. Instead of only seeing the estimate at one stock move, you can inspect the contract along a range of nearby stock prices and decide whether your limit should be more conservative or more aggressive.
That makes the chart a planning tool, not just a nice visual.