So I will answer my question myself.
It is working really well with an AR and an A4 on my macbook air 2012. The latency is absolutely fine for mixing / performing purposes as I don’T do finger drumming.
Each is coming with 6 channels (master or effects plus 4 channels - on the ar bd, sd, clap, deep tom rest on master on the a4 each track a channel into my mba.
made small channelstrips with utility, limiter, compressor and eq, controlling using an ipad with touchable as there is no space for my push right now.
the setup is awesome. I can#t remember when I had that much fun making music the last time.