I want to host some engine, but don't know which. I know about searxng and 4get, for example, but I know that there are a lot of other search engines. Here is question: how to pick one and by what criteria?
In my experience the best way to find out is to spin up your own instance and play around with it! Docker makes this super easy because you can throw it away after without making any changes to your server. Searxng works pretty easily in a docker container