Marakanetz: Another option might be the John Risch designed power filter "kit" offered by Kevin H. @ diycable.com. I have no personal experience regarding this one, though you should be able to gather feedback by doing a search @ AA (my memory is not good/great, but I seem to recall that you have an interest in DIY).
As far as locking/protective AC connections go (in regard to small children), please read my system details @ this site. What I have done for safety reasons (pets, not young children @ this late date:-) is a possibilty for many of us. The added bonus (other than safety, especially with hot tubes, let alone possibly fatal AC connections) is that your system will sound better without air-born vibration entering into the picture for source and/or tube based components. Placing a TT in such an isolated enclosure is a major upgrade, IMO, plus the signal tubes in your gear will not have a mind/sense to "sing along with the music". Footfall problems are also considerably reduced due to the wall/floor joint (even for a closet placed on a non-bearing wall). Sorry if this is too much to ponder, but you did mention safety.
As far as locking/protective AC connections go (in regard to small children), please read my system details @ this site. What I have done for safety reasons (pets, not young children @ this late date:-) is a possibilty for many of us. The added bonus (other than safety, especially with hot tubes, let alone possibly fatal AC connections) is that your system will sound better without air-born vibration entering into the picture for source and/or tube based components. Placing a TT in such an isolated enclosure is a major upgrade, IMO, plus the signal tubes in your gear will not have a mind/sense to "sing along with the music". Footfall problems are also considerably reduced due to the wall/floor joint (even for a closet placed on a non-bearing wall). Sorry if this is too much to ponder, but you did mention safety.