Getting back to the picture I saw of the towers at MSG. The picture shows 6 towers but gets cut off. Can't see the rest. I assume this is the main entrance with more towers that I couldn't see. There are 4 other smaller entrances with let's say 2 towers at each entrance I would guess there are a minimum of 14 to 20 towers. Just a guess but it gives a pretty good idea of what a large facility could use. Hopefully it is more.