If you have a non-MQA DAC, then whether or not the Rendering information is sent makes no difference because your DAC will ignore it as noise.
However, I always suggest setting to to No MQA Support, because that will allow you to then upsample the MQA decoder output. So, I can upsample, the 96 signal from the decode to 384 if I want, for example. If you leave it as the default Renderer Only, it will prevent you from doing further upsampling.
It switches between modes automatically. All regular FLAC files are upsampled to DSD512 in the DAC, all MQA gets first unfold and volume levelling in Roon and gets rendered on the DAC. It is seamless in use when configured how I want it.
Good to know that NO MQA retains the upsampling function of the DAC.
Renderer only is no option for me because my UD-505 did not receive an MQA ‘upgrade’ through the latest firmware. Tis only works for your NT-505 which has a network interface. The MQA function works through that interface.
Anyway, we now both have our specific best settings.