@dbastin In quickly perusing your setup the only issue I see is the wifi RFI issue in both Mikrotik and Devialet. Now I can see heroic issues taken by manufacturers to shield other circuits and components within devices, don't know if that case with these devices. My other issue is with the wifi receivers themselves, this especially vs a cleaned up and optimized ethernet input in a streaming device. This what my server accomplishes via my JCAT NetXE card. In my early days of streaming I went through a series of three different diy modded Mac Minis, won't go through all the permutations, but at one point was doing wifi with the 1st mini, eventually one of the mods was going to hard wire input, another subsequent move was to remove wifi antenna and disconnect circuit board connection to wifi receiver. In direct comparison there was an incremental improvement I could detect even in this relatively low level streaming setup. Not saying the Mikrotik and Devialet may have superior RFI suppression in their components. My own conclusion is absolutely no wifi on 'clean' or audio side of home network.
I'd also add RFI is likely an issue for us even with a 'clean' network for audio streaming. Most of us live in a very rich RFI environment, what with all the radio frequency equipment used on a mass scale. Some years ago I had located a Linn Mimik cd player in this one particular place in my listening room where I was picking up an FM station through my stereo system, moved the player no more issues. Dimmer switches are another source easily heard.So point is while this extreme example think how much RFI is masked, we simply don't hear it as an FM radio station of whatever, I presume very few of us really fully hear the full potential of our systems due to environmental RFI. I don't doubt are physical health impacted to some degree as well, plenty of info out there on this. In any case there are reasonable steps we can take to minimize it's impact on our stereo system.
