@Splintergroup Should a separate nut be used with those that you like screw up against the top? or is the friction between the t-nut and the threaded rod usually enough on its own?

Also, would you go for regular leveling feet:

Or would you opt for the kind that have a ball socket in the base so that they can swivel how they contact your floor?

I’m torn because on one hand swivel to match floor indents sounds good but on the other hand it could end up being frustrating or overengineered in practice.