Is it feasible to self host websites
yes
for small businesses
NOPE
Well, you say your business sites, so I assume you’re okay with downtime. I would absolutely not self-host sites for someone else’s business, because if something happens to the hosting (ISP outage, power outage, bad update, hardware failure, accidental deletion, misconfiguration, ISP block, flood/fire/storm, theft, I can go on) then it’s my ass on the line. Simple hosting is cheap, spend the few bucks for a lot more peace of mind.
Checking just one, or the user account itself, would be sufficient.