FishMtFarm
Emu whisperer
Yes I did use an incuview and put 3 eggs in there and pretty sure we could of made 4 fit. It was tight tho.I did, using an Incukit. It worked well and hatched some chicks
I've also heard the Incuview will work for emu eggs. Not sure how many eggs will fit in it but if I recall @FishMtFarm used one for some emu eggs so she might be able to tell you.
You can also fit about three small ones into a Nurture Right 360. But for six, you need something more sizeable. If you can get your hands on a Brinsea Octagon 40, I know you can fit eight in there. You'd have to find someone selling a used one though because Brinsea doesn't make them any longer.