Emulator fans the Bliss-box has hit production! The 4-Play is a modular controller adapter for both the modern and retro gamers connecting all your favorite console controllers (up to four at once) to your computer. The kick starter is live project 544088930 Bliss-Box - 4-Play - One Adapter for Many Controllers Sorry I can't post links.
I already have this adapter, had it about 4 years ago long before Ks. Mentioned it here a few times but people didn't seem interested.
Did you check out the kickstarter? This is similar but its a smaller better build production version. Its 4 Bliss-box in one, and a bit more portable not to mention a must lower price.
https://www.kickstarter.com/projects/544088930/bliss-box-4-play-one-adapter-for-many-controllers That one I assume.I could have used one last week lol.