Quartz tiles on tile backerboard, which adhesive is best?

[Time's Ran Out]

Quartz or resin? Who is supplying the tiles, do you know where they come from?

I ask because some available is of poor quality!
S2 Tilemaster for me.

 

[Dumbo]

hi all I've got 36 m of 600x600 Quartz tiles wat adhesive best to use on backer board I was thinking single part flex as its a extension on to a salon 6 rooms in total so quite awkward cuts nothing square so I don't want to have to keep mixing up addy I

I have fixed quartzite resin type tiles in my Ensuite single part flexible over dural ci matting . No problems used a water based sealer prior to grouting with bal micro max grout . Been down a few years now also has water underfloor heating below it