If you tried the WiiM Ultra and you like using Qobuz you SHOULD be using Qobuz Direct! Your WiiM connects perfectly via Qobuz Direct.
Then you will get the best out of the WiiM which can be controlled any way running the Qobuz app directly as you like: tablet, phone and/or computer. It's very good and someone mentioned the Echo as an audio controller.
In addition to going Qobuz Direct, if you have a fiber router from your provider, you would see improvement. In addition, no big money has to be spent from there. You can use Cisco 2960 or Cisco Meraki connected by fiber and then go in to the WiiM Ultra.
Got a couple of Cisco Merak running for less than $80. In less than five minutes I took out the internal power supply. It's easy. Then used Blue Jean ethernet cables from the router to the first Cisco and then short one from the second one to a WiiM.
Big bang for the buck and no four figure investment needed.