Hi Gianfri,
I have not used the Allo products myself but they have a very good reputation. You should have no trouble connecting a digital coax from the Allo Digione to your Yamaha. You need to check what is involved in adding Roon, Allo Digi Sig as Roon End Point . It sounds like a good solution for what you want to do.
I’d suggest getting just one to start with & see how it works. From what I’ve read a lot of folks seem to believe adding a linear power supply has a big impact on the sound. Given the relative high cost of linear power supplies I’d try the Allo without one first.
Regards,
Mario