The native Plug ins will work with Multirack Native together with the MWAVES Card – you just need to install the Soundgrid Driver (the “soundcard”).
But as Dusenklang said – for real low latency you need the Soundgrid Plugins along with an Soundgrid Server.
But as i know – there are many people working with the native System as well – on Digital Boards that do not have an Soundgrid Connection like Midas or Yamaha – and it works well far as i know it works well.