Hello @carlo_vigni,
While I cannot say that we have previously tested these 4G LTE Routers, they meet the specifications required of 5Ghz Bands and AC-band ability for high quality audio streaming. Ordered by best performance:
https://www.tp-link.com/la/products/details/cat-5032_Archer-MR200.html
I am also not sure if they would be fully compatible in Europe, so you may need to contact the manufacturers and let them know what service provider you are using to ask about compatibility first. If you would like to suggest a different router, I can check for you, but basically the difference here is that these routers have both 2.4Ghz and 5Ghz capabilities. Note: The 5Ghz network has a lot more bandwidth and you will be able to stream higher quality audio through that but make sure to set up the 5Ghz network correctly according to the manufacturer’s instructions. Hope this helps!
Thanks,
Noris