Mine were done with a sealer something to repel grease and oil spills. Forgot what brand I used. I also have hitch receivers installed in the floor so I have something sturdy to pull to or for fixtures. I drilled in rock anchors for my drill press and will do that for anything else I may need to be anchored such as a lift or something.
Some have come here and complained because I "ruined my floor" but then they don't work here and don't do what I do. My shop is small though..
I have tried most all of it and now do what is known to work..