captcha

I can use plugin captch By BestWebSoft with ajax, but I installed Skt NURCaptcha By Carlos E. G. Barbosa and this will not show in the login with ajax. is that because it is for main WP login?

The author of the plugin says:
It works on “POST” for submits. It probably won’t work with Ajax, but
depending on how the plugin works, it may work anyway because it does
check on hits to xmlrpc functions.

But that means nothing to me.

Could you suggest a recaptcha that would work with this login?

https://www.ads-software.com/extend/plugins/login-with-ajax/