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I just did some googling and i was combining the nuclear orange and the yellow argemia. Lol but one of the shrimps is placed in the RESTRICTED area but it is still up against the corner of the fence. But i googled the yellow and the votv wiki is the most up to date and says: 

"Spawn Condition(s):

- Place shrimps packs at all four corners of the perimeter fence, then place one on the drain in the basement of Alpha Root Base. Finally, be present in the basement between 00:00 and 01:00, stand a small distance away, and look away and up.

Location(s):

- All four corners of the perimeter fence enclosing the map (the fence extends into the restricted area)

- The basement of Alpha Root Base

Requirement(s):

- Playing on Story or Infinite mode

- Five Shrimps Packs

- Be present in the basement of the base between 00:00 and 01:00"

apparently how you drop them matters too as you must drop them from the inventory and then drag them to the drop spots so you can't drop them from your hand. Also the wiki says to place the 4 at the fences and then place the last one on the basement drain between 0:00 and 1:00 then step back, turn around and look up so the drain is opposite from where the player is looking. If all is done correctly that SHOULD spawn it but apparently a lot of people have problems with this one. Also the Arirals will eat shrimp packs that are left out after Day 12 (not sure if this date is still accurate) if players don't already have loyal reputation so it's possible the shrimp packs you leave in the corners are being eaten before you can finish the ritual. You could turn on rep debug and watch for the rep increase pop up while doing the steps to make sure that isn't happening.