Having been down this path a few years ago, I realize how confusing it can be. I have a QNAP NAS, installed Asset UPnP as well as MinimServer on it; both work well. I use my Oppo 205 as the digital hub since it decodes almost anything you throw at it. I have the Oppo connected to my Parasound P7 preamp.
There are various DNLA apps you can use to direct the music to your Oppo or whatever preamp you have. Oppo has an app. I also use the Creation 5+ app. If you have Linn front end digital gear, then by all means use the Linn apps. Sadly they don't work with my gear.
I also briefly used a SimAudio Mind player, worked well, well built, but it's stereo only.
There are various DNLA apps you can use to direct the music to your Oppo or whatever preamp you have. Oppo has an app. I also use the Creation 5+ app. If you have Linn front end digital gear, then by all means use the Linn apps. Sadly they don't work with my gear.
I also briefly used a SimAudio Mind player, worked well, well built, but it's stereo only.