Roon set up streaming - problem

[ThomasD]

I have some problems with drop outs when streaming music with Roon.
What shall I do?

My set up:
Devialet Expert Pro 220
Mac Book Pro is used as as a Roon Core.
When streaming I use Qobuz via Roon.
I run everything via wifi
I have quite a strong wifi network, TX better than 110 MBit/s

I do not use USB or ethernet cable.  

It is not possible to connect an ethernet cable from router to Devialet ?
I tried to connect an ethernet cable from Mac to Expert but that did not work(seems very complicated for a normal user).

What can I do to improve conditions? Change settings in Roon? 

Does the music stream from the router to the Expert or via Mac to Expert? Can I not stream Qobuz from Mac to Devialet by Ethernet cable?

Thankfull for advice