What add-on are you using to do that? I've been playing around using Lovely Table and Awesome Table for this purpose but not really sure which one I ultimately want.
The problem with hosting your own instance of searx is that you will most likely be one of the only users and since the underlying search engine (Google, etc) knows where the traffic came from (your instance) they can pin it on you so you might as well just use Google directly. Also, I keep getting captcha errors when I try to use searx.
https://github.com/jivesearch/jivesearch. I run my own instance with the crawler so I don't rely on Yandex (their default). I switched when DDG purged a lot of their !bangs. Even though I don't use the purged !bangs much I felt they were censoring.