The explorer 2 decodes MQA and does Hi Res up to 192KHz It has Line out 2v and Headphone out.
The explorer will not decode MQA but has opticle out. Discontinued I believe.
I don’t know if iOS local out comes with Roon 1.3, a lot of people want it.
You should check the specs from meridians website. There is a dealer offer in the UK till the end of Jan at £129.00 Five year Waranty if registered and three moth Tidal trial.
Similar in the US I suppose.
Roon would love to, but at the moment it is an issue with how iOS is coded and Apple app functionality rules.
As others have stated, Android doesn’t have the restriction and can function as an endpoint. I often play music from the server straight to my phone and listen. Heck, I even have old phones I just use as mobile audio endpoints so I can pair them with bluetooth speakers or headphones while out in the garden.