Digital add ons-airlens, matrix spdif, Innuous Phoenix net, Phoenix usb

I’m not technically inclined… and I’m confused.  I’m now using an Innuous Zenith 3, a PS Audio directstream 2, a matrix spdif and an Innuous Phoenix usb.  Now I’m tempted by the Innuous Phoenix net and/or by the new Ps Audio airlens.  But I don’t totally understand what all these add ons do or where they would go in my system.  I just know that I’m on a never ending search for the best sound, probably like everyone here .  I’m willing to add either (or both) devices and also to remove things I’m now using.  I realize that adding too many accessories probably can over complicate things and multiple connections probably can degrade the sound.  I welcome any advice!