Hi,
eggs are incubated at 99°F/37°C .
I would use a closed container with the cuttings inside to keep humidity next to the cuttings and not at the walls of the incubator .
In which usda Zone are you ?
Be prepared for the next step, that is the potting . Will you have the place, a light, and a warm room to help the cuttings ?
Since, you haven't started the rooting process yet, wouldn't it be best to wait one month more ? Just saying . Or on purposes, don't throw all your eggs in the same basket, and start half of the cuttings now,
and the remaining in one month :)
If I had an incubator and the space for them, I would be incubating chickens...
Good luck .