Thanks for the replies. I will order a WiiM pro this week - I’m not sure if a remote is worth getting or if it is best used via phone/iPad.
WRT the 5200HC I obviously have a ‘legacy’ processor so I assume I need legacy connections, particularly as the centre is the master speaker.

568.2mm, DSP6000, DSP5200HC, DSP33 rears, HD621, LG G3, Sony UBPX800-M2, F80.