You have to spread out multiple apps across different card issuers.

Most companies will not approve multiple apps to different card products on the same day. Chase only allows two apps per 30 days. That is why you see most people's AORs look like:

Citi Exec
Chase Sapphire
USBank Club Carlson
Wells Fargo Propel

You got two approved because of their rules - the others will be denied. As examples, Citi would auto deny all but one app on the same day (1 card per 8 days, 2 cards per 65 days), as would AmEx.