Cofounder relationships are among the most important in the entire company.
Or a way to stay on strangers couches, that just sounds terrible all around.
For early employees you want people that have somewhat of a risk-taking attitude.
No matter what you choose, build stuff and be around smart people.
You don't need to make the structure complicated, in fact you shouldn't. All you need is for every employee to know who their manager is.
Aim to be the best in the world at whatever you do professionally. Even if you miss, you'll probably end up in a pretty good place.