I think it would be helpful if there was a single site that showed the statuses of all mixers at the same time, don't you think?
I recently tried to do something like that, but almost all mixers have strong bot protection, so my check did not always give the correct result. Most of the mixers were offline after such a check. And it's too much work for manual checking.
It is even more difficult with onion pages.
I created an API with site status checker to image, and unfortunately, yes, there are sites that has strong bot protection, those who uses cloudflare with strong protection configuration, like webmixer and unijoin (i guess). About the TOR mirrors, unfortunately, it will be hard to have them, unless there onion sites tracker with api which i never check yet.

https://pxzone.online/tool/website-status?site=https://tumbler.io&type=img

https://pxzone.online/tool/website-status?site=https://mixtum.io&type=img