It’s all about how and who you pick as tenants.
Many states have a little known law that if you live in the duplex or triplex, you can discriminate as much as you want. makes sense if you think about it.
Yep, you are correct. The big change in how you have to do business happens at 5 units. I had 4. I liked widows. No noise, no mess, perfect payers, seldom moved. Just respond right away when something breaks and they are happy.