What if I want the yolks slightly firm?

If you want the egg yolks to be jammy but slightly firm, you can add two minutes to the cook time. Air fry the eggs for ten instead of eight minutes.

Should I let my eggs come to room temperature first?

No, for this recipe use cold eggs from the refrigerator. This is how I've tested this recipe, and results may vary with room temperature eggs.

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Place the eggs in the basket of your air fryer.
Set the time to 270°F for 8 minutes.
In a medium bowl, combine the ice and water to make an ice bath.
When the cooking time is up, use a large serving spoon to carefully transfer the cooked eggs to the ice bath.
Let the eggs sit in the ice bath for just 1-2 minutes to stop the cooking process.
Then, place each egg in a serving cup. Carefully remove about the top inch of the peel of each egg. Enjoy the egg with a spoon.

You can easily double or even triple this recipe depending on how big your air fryer basket is. Just try to leave a little space between each egg in the basket and do not overlap the eggs.
I used eggs straight from the refrigerator. If you eggs are at room temperature, then you may need to reduce the cook time by 1-2 minutes.
Soft boiled eggs are best served right after they are made.
Some air fryer models needs to be preheated. Please refer to the owner’s manual of your particular model to see if you need to preheat it before using.
Also, please note that air fryers vary from model to model. If you think your air fryer runs hot, then you may want to reduce the cooking time for these eggs to just 7 minutes. Then, cut the end off one egg to see if the white is cooked through. If the egg white is still runny, then place the egg back into the basket and cook for 1-2 minutes longer (you can prop up the egg that you opened with a little ball of aluminum foil so the egg doesn’t spill).