Question about Bose UFS-20 Series II Universal floor stand

I think so. As far as I know, the small speakers all have the same mounting option on the back. Bose also offers them as accessories for the Lifstyle 48. To be sure, just ask Bose.

I can't say, I have the Bose Soundtouch 300 speakers on it.

I can't say I've used them for Logitech Z series boxes.