It's a hard choice. I've disclosed at work (like finally and after at least 2 previous sabbaticals for MH) and taken less work on because it's time to prioritise my mental health.

So it took some time. And I kinda knew what the overall reaction would be.

For 'look see' like that I'd have previous appointments, evaluate the place, including whether they are MH friendly, then disclose when needed.

It's a lot easier for an employer to make accommodations when they know you and your good work. When you, as a prospective person with (I assume) competition for the place, some will be like, where all else is equal why take the one who, at the very least, is a scheduling hassle, if not some one we 'are' continually going to have to make accommodations for...

As for stigma I get you on that but sometimes put me first and then when you are settled fight for others
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