I was able to get a tower from a business that wasn't using it anymore, and now am looking to get it put up. I've looked at a few pictures of how to mount it, but would love some feedback. What is the best way? I was originally thinking about bolting it to concrete with anchors. It appears that some are poring a concrete slap and cementing it in. This tower is probably20-30 feet tall. I have no particular base, only the three legs. tips?