Can anyone tell me the correct way to link these 3 devices to get 4K and 5.1 sound?

The Shield has one HDMI output.

The TV has HDMI1, HDMI2 (ARC) and HDMI3

The Home theater system has HDMI1, HDMI2 and To TV

The only way I can get Netflix to play in 4K/5.1 is to plug the Shield into the Home Theater and then out to the TV, then the TV Netflix app does both but the Shield Netflix app does neither.

If I plug the Shield into the TV and the Home Theater system into the TV via ARC, then both Netflix apps will play in 4K but no 5.1 sound.

The aim is to get the Shield to output 4K/5.1 from its Netflix app and also 5.1 from the Kodi app.

Thanks.;