Just 1 shrimp..... once the ammonia spikes take it out and from that point check the ammonia and nitrite levels every couple of days. The tank isn't cycled until you see the ammonia and nitrite levels spike and go to 0... that's why you have to test it.
When they go to 0, you should have a nitrate reading.... at this point do a 10% waterchange and you should be able to add inverts and see how they do.
Just noticed you have a 92 gallon.... use 2 shrimp. :happyfish