Over head cover, angle of the blinds (panels) with tall brush taking up the dead space in between & lids can help. Depending on the area you hunt I've used tumbleweed to pull into the gaps in between hunters to fill space.
I have a ghillie blanket that I lay across between shooters on the boat blind and made grassed panels to go between shooters on the floater. I'm a fan of only having enough "hole" for a shooter...cover the rest, cover in between.