Shameless plug, the company I work for makes a really low-latency remote desktop app. We originally built it for gaming, but a lot of people use it for creative work as well. It supports dual monitors! https://parsecgaming.com
It is unclear if OP wants to remotely view Hackintosh or Laptop, I read it as wanting to control Hackintosh using laptop.
the main thing I want to figure out now is how to get 4k to transmit cleanly with parsec. It looks like quality is being reduced though bandwidth should be plenty.