Advice on incorporating in the US as an EU citizen

I got it that it is easy to start a Delaware C Corp as an EU Citizen who is still based in the EU. However, I am wondering if there might be any complications if the cofounders stay in the EU for the next few years. I think the cofounders might be able to be paid as contractors. Has anyone here had some experience with this specific use case? And when would it be necessary to incorporate a subsidiary in the EU?