File MQA and bitrate

Hi, I have the dac SMSL M500, full MQA …
How did I set up the player?
Do I have to tick MQA RENDERER or MQA DECODER?

Set it as MQA decoder.

doing so is it normal to read the bitrates at the bottom right on Audirvana with a value of 24 / 44.1 or 24/48 hz? regardless of the incoming MQA file?

Yes, since Audirvana is passing the bit perfect stream to the DAC which then performs the “unfolding”.