Thanks for the warning. I'm on PReP and get tested for STI's regularly - and have received as many vaccinations as you can get (Hep, HPV, etc). I am vigilant about my PReP schedule - and generally assume that most people are positive and proceed accordingly.
I worry a bit on the forum about stigmatizing people who are HIV positive, when so many of my friends and associates (and sex workers I know) are taking their meds and remain undetectable. My take on it is - if you're hiring - and that is a big concern for you - get on PReP. That way, no matter what they are doing, you're covered on your end from an HIV perspective (STI's - and the level of risk of you choose in your activities related to STI's - is a separate matter). As someone relatively new here, I notice a lot of anxiety surrounding escorts and HIV status rather than other STI's... I was around for the plague - so I get it. But - I think it's important to take responsibility for your own sexual health (as much as you can) - and not look to anyone to "disclose" or "not disclose" to you.