Don't buy one of the Pop-Ups,they will be too small. You'll need a Hub Style Blind to fit three people. I have one of Bass Pro Shops' "Blackout" Bllinds, with an 82" Hub-to-Hub, and you could easily fit three adults in it. It is very well made, has shoot-through windows, and sets up easily. Be prepared to spend some money though, they usually run about $199.00, but if you get lucky, you can catch them on sale for $159.00.
Wally World has some for 64.00 on sale was 89.99 not sure of the size looked big enough for what you would need. I might pick one up myself check them out online gulf breeze store had 5 left last night all there camo/hunting stuff is on sale.