I have added a Naim AV2 to my Loewe TV. Together with a Nait 5 as poweramp, it works beautiful. The AV2 has analogue and digital ports: coax + optical. The benefit of an AV2 is that it will take care of all nasty things in an AV setup. It ensures good grounding by using the din cables and I assume it has galvanic isolation - also on the coax. It is only available s/h.
Besides the technical fit within a Naim + AV setup, it has great sonic qualities. It works just well while listening to the Berliner Philharmoniker e.g. (what I'm doing now actually).
It is only available S/h since it is discontinued for many years.
I have tried a Chord Mojo. I use the Mojo currently in another system, but in an AV setup it is a candidate for issues. You wrote that you are using optical, but imagine a new TV which has only a coax digital output: the Mojo has no galvanic isolation and the sound quality will be compromised by all kind of tweaks you need to do to get it working (get rid of a possible ground loop). The Mojo also has a delay. All the up and over sampling makes the Mojo too slow for live music. With a Mojo, you are likely to run into lip-sync issues. Hopefully the Samsung has a lip-sync feature which works good ...
Not trying to bash the Mojo here, as a headphone amp and / or connected to my isolated Raspberry it works quite nice.