The P8000 is listed as a supported printer in the latest version of QTR, so it should work so long as you have the latest version. The 5370 is brand new and so is not supported, yet, but given that it has the P900 head I have faith that Roy Harrington will support it sooner or later.
I'm also a PC user, so it's hard to comment, but as QTR on Mac is a printer driver then I assume that paper selection and other settings are selected in the same way as other printer drivers. If not then Print Tool is your friend, but I think it means saving an exported image from LR, which is what Win users have to do.
There is a dedicated QTR group on groups.io where most people seem to be on Mac and Roy seems moderately active. You're going to get most information and advice there.