I have a 4 year old kamoer ATO that works so well for me that I bought another for a second tank last year, so now I have 2 of them. Very reliable units.
I use and like the Tumze osmolator. I was initially concerned about the pump speed (unnecessarily fast, IMO) but there are three different ways it would stop itself in some sort of problem situation.
My ATO is done within my Hydros controller along with the AWC. I think most controllers will do ATO if you are going to get a controller for your system.
Jbj would be first choice but discontinued! I’ve went through several top offs including the older tunze but the brand new one works very well! That would be my second choice.