The thing about this site, and the internet in general, is that you have to sift through all of the parroted information (whether it be true or false), and try and learn from people who actually have experience dealing with the things they are talking about.
If you run an unregulated UTH, it may not currently be too hot to cause any harm to your snake, but there is no safety net if it for some reason malfunctions. If it's on a thermostat, it will completely shut off if something goes wrong.
Ball Pythons are pretty hardy snakes, which is why you get a lot of conflicting opinions on the best ways to do things. Snakes are pretty good at not showing symptoms of illness also. A new keeper may not be able to tell if something is wrong.
Safest option for an inexperienced person, house each snake individually. Definitely a great idea to regulate your heat source also. Provide a thermal gradient so the snake can pick and choose where it wants to be. 78-82 degrees on one end and 90-92 on the other. Keep the humidity at a reasonable level (50-60%) and give them places to hide.
Other than that, it's not rocket science. Good luck with your new snakes.
A lot of what is considered 'bad snakekeeping' seems to be largely based on opinion. Check out Al Coritz' channel on Youtube. I've noticed some of the things that he does, a lot of people here would bash any day of the week. But he's about a thousand times more experienced than most of those people.