Worth noting that the absolute best quality Deezer has is 44,1kHz 16-bit lossless, and most songs there are MP3 anyway.

If this is good enough for you, absolutely go for it. If you're looking to download high-quality music from a streming service, you can use tidal-dl (or tidal-gui for more convenience) combined with Tidal - though it's worth noting Tidal has been subject to some controversies regarding some of the master quality albums, too.