I did Victorian style mosaic tiles on my hallway floor and used self-levelling (we had a concrete pad under some of the floor, screwed down the boards, then a sheet of 12mm(?) OSB over the top. Less bendy than ply that thick. Tiles still look good after 6 years.
Engineered wood is 18mm and should be laid over a foam underlay to absorb noise. Adjust the thickness of your OSB subfloor to get the tiles the same height as the floor.
I did Victorian style mosaic tiles on my hallway floor and used self-levelling (we had a concrete pad under some of the floor, screwed down the boards, then a sheet of 12mm(?) OSB over the top. Less bendy than ply that thick. Tiles still look good after 6 years.
I posted in this very thread https://www.lfgss.com/comments/13789198/
Engineered wood is 18mm and should be laid over a foam underlay to absorb noise. Adjust the thickness of your OSB subfloor to get the tiles the same height as the floor.