John,

Seems like all the drains have some type of drawback or negative comments from people online.

Proline - floor cutting and potential to weaken floor / deflection problems may occur

Kerdi - many are not so sure of the foam pad that they use, 1" high

ACO - some have said that it has little flow in the channel an can begin to stink,some don't like the flange version.

Noble - internal of drain has too many nooks and crannies that can catch lots of junk and not all that easy to remove drain lid, Also is 1.5" high.

So I think you have to just find one that works for you and then try to work around this deficiences. Don't you think?